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Case Study Questions Class 10 Science The Human Eye and Colourful World

Case study questions class 10 science chapter 11 the human eye and colourful world.

The Human Eye and Colourful World case based question answer

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.

Case study 1

As we know that, the ciliary muscles are responsible for change in focal length of the eye lens. And this ability of eye lens to change the focal length is referred as accommodation. The least distance of distinct vision of normal eye is a about 25 cm and the far point of normal eye is found to be at infinity. Because of refractive defects of vision in human being 3 defects are possible they are myopia, hypermetropia and presbyopia. In case of myopia, person is able to see nearby objects clearly but cannot able to see distant objects distinctly. In this defect, the image is formed in front of retina and hence to correct this defect concave lens which is a diverging lens of suitable power is used to form the image on the retina. In case of hypermetropia, the person is not able to see nearby objects clearly but he is able to see distant objects distinctly. And hence in this case, the image is formed behind the retina because of that to correct this defect convex lens which is converging lens of suitable power is used to form the image on the retina.

Presbyopia is the defect of vision which occurs with ageing. Such person is not able to see nearby objects clearly and distinct objects distinctly without proper eye glasses. The persons which are suffering from both myopia and hypermetropia uses bi-focal lenses.

Questions :

1) Which reasons are responsible for myopia?

2) Hypermetropia is also called as?

3) A student who is sitting on the first bench in the class is not able to see what is written on the board. The student is suffering from which defect and which type of lens is suitable for him?

4) What is cataract?

1) The defect myopia occurs because of excessive curvature of eye lens and elongation of the eye balls.

2) Hypermetropia is also called as far-sightedness because person suffering from hypermetropia is able to see distant objects clearly but cannot able to see nearby objects clearly.

3) The student sitting on the first bench in the class is not able to see what is written in the board because that student is suffering from hypermetropia in which person is able to see distant objects distinctly but cannot able to see nearby objects clearly. And hence to correct his defect he should have to use convex lens of suitable power.

4) Sometimes, at old age the crystalline lens of people becomes cloudy and milky and that condition is called as cataract because of which the person may lose partial or complete vision. And it is cured by cataract surgery only.

Case study 2

There are various natural phenomenon associated with light. Refraction of light is the phenomenon in which when light travels from one transparent medium to another transparent medium it changes its direction. The change in direction of light is due to the change in velocity of light in different media. And hence the path of the light also changes in different media. In case of refraction of light through rectangular glass slab we must observe that the incident ray and the emergent ray are parallel to each other. We can see the pencil immersed in water as bent at the water air interface only because of the refraction of light. Again second phenomenon is dispersion of light in which white light when passed through the prism it splits into seven coloured spectrum. And these seven colours are VIBGYOR. We can see here the angle of deviation is different for different colour because different wavelengths of different colour. Also, Newton observed that when second prism is placed inverted to first prism the white light incident on the first prism will come out as white light only when emerges out from second prism. The phenomenon of formation of rainbow is also because of the dispersion of light. In that case the tiny water droplets acts as prism.

But most importantly, the refraction of light occurs only because of the change in refractive index of medium. The twinkling of stars is due to the atmospheric refraction of light.

1) Rainbow formation takes place because of which phenomenon related to light?

2) What is mean by total internal reflection?

3) Why atmospheric refraction occurs?

4) For which colour the angle of deviation is more in case of dispersion?

1) Rainbow is formed because of total internal reflection of light, dispersion of light and refraction of light.

2) When a ray of light travels from one medium to other, if the angel of incidence is greater than the critical angle then the incident light get reflected totally in the same medium is called as total internal reflection.

3) The atmosphere contains different layers which contains hot and cold air. The hotter air is lighter than the cooler air. And hence the refractive index of hot air is less than the cooler air. As there is continuous change in refractive index of different layers of atmosphere, the atmospheric refraction takes place.

4) The angel of deviation is more for violet colour. And it decreases from violet to red in VIBGYOR.

Case study 3

The Tyndall effect is related to scattering of light. The blue colour of the sky, colour of water in the deep sea, the reddish colour of sun at sunrise and sunset are the colourful phenomenon of light related to scattering. The spreading of light when it strikes to small dust particles, smoke particles which are present in the air is called as scattering of light. When we will send the beam of light through the true solution we will observe the path of beam is not visible. While in case of colloidal solution the path of the beam is visible because of colloidal particles which are somewhat larger in size. We know that atmosphere contains large number of very small particles it means it is a heterogeneous mixture which contains smoke particles, tiny water droplets, suspended particles of dust and air. When light passes through such a heterogeneous mixture the path of the light becomes visible because it strikes with such particles. This effect is called as Tyndall effect. Sometimes we can see the visible beam of light entering into the smoke filled room through a small hole. In canopy of dense forest also, the light coming shows the visible path. Here the scattering of light is due to the water droplets present in the mist. In case of scattering of light, if the particles are having very small size then the light scattered more is of shorter wavelength that is blue colour and scattered red light is less of longer wavelength.

1) The reddening of the sun at sunset and sunrise is because of

a) Dispersion of light

b) scattering of light

c) refraction of light

d) total internal reflection of light

2) Which colour is having longest wavelength?

3) The advance sunrise and delayed sunset are because of

a) Scattering of light

b) dispersion of light

c) reflection of light

d) atmospheric Refraction of light

4) Which coloured light scatter more and why?

2) The red colour is having longest wavelength and wavelength increases from violet to red in the sequence VIBGYOR.

4) The blue coloured light scatter more because the wavelength of blue colour light is shortest. And scattering of light increases as the wavelength of light decrease.

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case study based questions on human eye and colourful world

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Case Study Questions Class 10 Science Chapter 11 The Human Eye and The Colourful World

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CBSE Board Exam is on the way, so you must practice some good Case Study Questions Class 10 Science to boost your preparation to score 95+% on Boards. In this post, you will get Case Study and Passage Based Questions that will come in CBSE Class 10 Science Board Exams.

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Re a son . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

The Human Eye and The Colourful World Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 11 The Human Eye and The Colourful World

Case Study/Passage-Based Questions

Question 1:

(i) The splitting of white light can be done by

Answer: (b) prism

(ii) Which property of light is used by prism to form a spectrum?

Answer: (b) Refraction

(iv) When a red light passes through a prism, it (a) will not split (b) will split into seven colours (c) will split into white colour (d) will split into many different colours

Answer: (a) will not split

(v) The spectrum produced by the white light by a prism is called

Answer: (b) impure spectrum

Question 2:

Atmospheric refraction is the phenomenon of bending of light on passing through the earth’s atmosphere. As we move above the surface of the earth, the density of air goes on decreasing. Local conditions like temperature etc. also affect the optical density of the earth’s atmosphere. On account of atmospheric refraction, stars seen appear higher than they actually are; advanced sunrise; delayed sunset, the oval appearance of the sun at sunrise and sunset; stars twinkle, planets do not.

(i) Due to atmospheric refraction, the apparent length of the day (a) increases (b) decreases (c) remains the same (d) all of these

Answer: (a) Due to atmospheric refraction, apparent length of the day increases by 4 minutes.

(ii) Apparent position of the star appears raised due to (a) atmospheric refraction (b) scattering of light (c) both (a) and (b) (d) none of these

Answer: (a) Apparent position of the stars appears raised due to atmospheric refraction.

(iii) The sun appears oval-shaped or flattened due to (a) dispersion (b) scattering (c) atmospheric refraction (d) cannot say

Answer: (c) atmospheric refraction

(iv) Twinkling of stars and non-twinkling of planets is accounted for by (a) scattering of light (b) dispersion of light (c) atmospheric refraction (d) none of these

(v) In absence of atmosphere, the colour of sky appears (a) blue (b) black (c) red (d) yellow

Answer: (d) yellow

Case Study 3: The human eye is a complex organ that enables us to perceive the world around us. It consists of various parts that work together to provide vision. The cornea is the transparent outer covering of the eye that helps in focusing light. The iris, the colored part of the eye, controls the amount of light entering the eye by adjusting the size of the pupil. The lens, located behind the iris, further focuses the light onto the retina, which contains light-sensitive cells called rods and cones. These cells convert light into electrical signals, which are then transmitted to the brain via the optic nerve. The brain processes these signals and interprets them as visual images. The eye is capable of adjusting its focal length through a process called accommodation, allowing us to see objects at different distances clearly. The eye is also sensitive to different colors due to the presence of cones that respond to specific wavelengths of light. Understanding the functioning of the human eye and the properties of light helps us comprehend vision, perception, and phenomena such as refraction, dispersion, and the formation of images.

What is the function of the cornea? a) Controlling the amount of light entering the eye b) Focusing light onto the retina c) Transmitting electrical signals to the brain d) Providing vision Answer: b) Focusing light onto the retina

What part of the eye controls the amount of light entering the eye? a) Cornea b) Iris c) Lens d) Retina Answer: b) Iris

Where are the light-sensitive cells called rods and cones located? a) Cornea b) Iris c) Lens d) Retina Answer: d) Retina

How are visual images transmitted to the brain? a) Via the cornea b) Via the iris c) Via the optic nerve d) Via the lens Answer: c) Via the optic nerve

What is the process called that allows the eye to adjust its focal length? a) Accommodation b) Refraction c) Dispersion d) Reflection Answer: a) Accommodation

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Case Study and Passage Based Questions for Class 10 Science Chapter 11 The Human Eye and The Colourful World

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In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Here, we have provided case based/passage based questions for Class 10 Science Chapter 11 The Human Eye and The Colourful World .

Question 1:

Read the following and answer any four questions from (i) to (v).

The spreading of light by the air molecules is called scattering of light. The light having least wavelength scatters more. The sun appears red at sunrise and sunset, appearance of blue sky it is due to the scattering of light. The colour of the scattered light depends on the size of particles. The smaller the molecules in the atmosphere scatter smaller wavelengths of light. The amount of scattering of light depends on the wavelength of light. When light from sun enters the earth’s atmosphere, it gets scattered by the dust particles and air molecules present in the atmosphere. The path of sunlight entering in the dark room through a fine hole is seen because of scattering of the sun light by the dust particles present in its path inside the room.

(i) To an astronaut in a spaceship, the colour of earth appears (a) red (b) blue (c) white (d) black

(ii) At the time of sunrise and sunset, the light from sun has to travel. (a) longest distance of atmosphere (b) shortest distance of atmosphere (c) both (a) and (b) (d) can’t say

(iii) The colour of sky appears blue, it is due to the (a) refraction of light through the atmosphere (b) dispersion of light by air molecules (c) scattering of light by air molecules (d) all of these.

(iv) At the time of sunrise and sunset (a) Blue colour scattered and red colour reaches our eye (b) Red colour scattered and blue colour reaches our eye (c) Green and blue scattered and orange reaches our eye (d) None of these

(v) The danger signs made red in colour, because (a) the red light can be seen from farthest distance (c) both (a) and (b) (b) the scattering of red light is least (d) none of these

Question 2:

Read the following and answer any four questions from (i) to (v)

Atmospheric refraction is the phenomenon of bending of light on passing through earth’s atmosphere. As we move above the surface of earth, density of air goes on decreasing. Local conditions like temperature etc. also affect the optical density of earth’s atmosphere. On account of atmospheric refraction, stars seen appear higher than they actual are; advanced sunrise; delayed sunset, oval appearance of the sun at sunrise and sunset; stars twinkle, planets do not.

(i) Due to atmospheric refraction, apparent length of the day (a) increases (b) decreases (c) remains the same (d) all of these

(ii) Apparent position of the star appears raised due to (a) atmospheric refraction (b) scattering of light (c) both (a) and (b) (d) none of these

(iii) The sun appears oval shaped or flattened due to (a) dispersion (b) scattering (c) atmospheric refraction (d) cannot say

(iv) Twinkling of stars and non-twinkling of planets is accounted for by (a) scattering of light (b) dispersion of light (c) atmospheric refraction (d) none of these

(v) In absence of atmosphere, the colour of sky appears (a) blue (b) black (c) red (d) yellow

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2 thoughts on “ Case Study and Passage Based Questions for Class 10 Science Chapter 11 The Human Eye and The Colourful World ”

In absence of atmosphere, the colour of sky appears Black

the question is asking about the colour of the earth, not the sky!

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Case Study Chapter 11 Human Eyes and Colourful World

Please refer to Chapter 11 Human Eyes and Colourful World Case Study Questions with answers provided below. We have provided Case Study Questions for Class 10 Science for all chapters as per CBSE, NCERT and KVS examination guidelines. These case based questions are expected to come in your exams this year. Please practise these case study based Class 10 Science Questions and answers to get more marks in examinations.

Case Study Questions Chapter 11 Human Eyes and Colourful World

Case/Passage – 1 Human eye is spherical in shape and has diameter of about 2.5 cm. Sclerotic is a tough, opaque and white substance forming the outermost coating of the eyeball. The front portion is sharply curved and covered by a transparent protective membrane called the ‘cornea’. Inner to the sclerotic there is a layer of black tissue called as choroids consisting of a mass of blood vessels, which nourishes the eye. The black colour does not reflect the light and hence rules out the blurring of image by reflection within the eyeball. Behind the cornea, the space is filled with a liquid called the aqueous humour and behind that a crystalline lens. ‘Iris’ is a muscular diaphragm lying between the aqueous humour and the crystalline lens. Iris has an adjustable opening in the middle called the pupil of the eye. The pupil appears black because all the light entering is absorbed by the ‘retina’, which covers the inside of the rear part of the ball. Iris controls the amount of light entering because the retina absorbs nearly all the light, which falls upon it. This is done by varying the aperture of the pupil with the help of the iris. In dim light the iris dilates the pupil so that more light can enter in. When the light is bright the pupil contracts. The crystalline lens divides the eyeball into two chambers.The chamber between the cornea and the lens is called the anterior chamber filled with a fluid called aqueous humour while the chamber between the lens and the retina is called the posterior chamber which is filled with a transparent gelatinous substance called vitreous humour. The refractive indices of the cornea, pupil lens and fluid portion of the eye are quite similar. So, when a ray of light enters the eye, it is refracted at the cornea. This refraction produces a real inverted and diminished image of distant objects on the retina. When the object is kept at different distances then, we may expect the image to be formed at different distances from the lens. It means, it may not form on the retina always. But in reality it is not so. Image is always formed on the retina. This is possible because the curvature of the crystalline lens is altered by ciliary muscles. When the eye is focused on infinity the muscles are relaxed and the eye lens remains thin. If the object is brought near by, the curvature increases so that the image can be formed on the retina. This property of the eye lens is called accommodation.

Question: The fluid between the retina and the lens is called ______ (a) aqueous humour (b) vitreous humour (c) aqua (d) humus

Question: The part of the eye where optic nerves enter the eye (a) pupil (b) ciliary muscles (c) retina (d) blind spot

Question: The change in focal length of an eye lens to focus the image of objects at varying distances is done by the action of _______ (a) pupil (b) ciliary muscles (c) retina (d) blind spot

Question: The inner back surface of the eyeball is called (a) pupil (b) ciliary muscles (c) retina (d) blind spot

Case/Passage – 2

The phenomenon of decomposition of the white light into its seven component colours when passing through a prism or through a transparent object delimited by non parallel surfaces is called dispersion of light. A beam of light containing all the visible spectrum of the light is white, because the sum of all the colors generates the white color. The light is decomposed in all the component colours, Violet, Indigo, Blue, Green, Yellow, Orange and Red, called as VIBGYOR. The band of the coloured components of a light beam is call d its spectrum. The phenomenon can be explained by thinking that light of different colours (different wavelengths) has different velocities while travelling in a medium vm = f λm. Hence, the change in velocity of light observed when the light passes from the air to the glass, depends on the wavelength.

Question: A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

Question: When white light is allowed to pass through a glass prism, which colour deviates the most? (a) Indigo (b) Green (c) Red (d) Violet

Question: Which of the following statements is correct regarding the propagation of light of different colours of white light in air? (a) Red light moves fastest (b) Blue light moves faster than green light (c) All the colours of the white light move with the same speed (d) Yellow light moves with the mean speed as that of the red and the violet light

Question: For a prism material,refractive index is highest for (a) Red (b) Yellow (c) Orange (d) Violet Passage Based Questions

Question: When white light is allowed to pass through a glass prism,which colour deviates the least? (a) Violet (b) Red (c) Green (d) Orange

Case/Passage – 3

The ciliary muscles of eye control the curvature of the lens in the eye and hence can alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained the curvature of lens increases (that means radius of curvature decreases) and focal length decreases. For a clear vision the image must be on retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye-lens. It is about 2.5 cm for a grown-up person. A person can theoretically have clear vision of objects situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possible focal length. The ciliary muscles are most strained in this position. For an average grown-up person minimum distance of object should be around 25 cm. A person suffering for eye defects uses spectacles (Eye glass). The function of lens of spectacles is to form the image of the objects within the range in which person can see clearly. The image of the spectacle-lens becomes object for eye-lens and whose image is formed on retina. The number of spectacle-lens used for the remedy of eye defect is decided by the power of the lens required and the number of spectacle-lens is equal to the numerical value of the power of lens with sign. For example power of lens required is +3D (converging lens of focal length 100/3 cm) then number of lens will be +3. For all the calculations required you can use the lens formula and lens maker’s formula. Assume that the eye lens is equiconvex lens. Neglect the distance between eye lens and the spectacle lens.

Question: Maximum focal length of eye lens of normal person is (a) 25 cm (b) 2.5 cm (c) 25/9 cm (d) 25/11 cm

Question: Minimum focal length of eye lens of a normal person is (a) 25 cm (b) 2.5 cm (c) 25/9 cm (d) 25/11 cm

Question: A nearsighted man can clearly see object only upto a distance of 100 cm and not beyond this. The number of the spectacles lens necessary for the remedy of this defect will be (a) +1 D (b) –1 D (c) + 3 D (d) – 3 D

Case Study Chapter 11 Human Eyes and Colourful World

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Human Eye and Colourful World Case Study Based Questions Class 10

Students who are studying in CBSE class 10 board, need to get the knowledge about the Human Eye and Colourful World Case Study Based Questions. Case based questions are generally based on the seen passages from the chapter Human Eye and Colourful World. Through solving the case based questions, students can understand each and every concept.

With the help of Human Eye and Colourful World Case Study Based Questions, students don’t need to memorise each answer. As answers for these case studies are already available in the given passage. Questions are asked through MCQs so student’s won’t take time to mark the answers. These multiple choice questions can help students to score the weightage of Human Eye and Colourful World.

Human Eye and Colourful World Case Study Based Questions with Solutions

Selfstudys provides case studies for the Class 10 Science chapter Human Eye and Colourful World with solutions. The Solutions can be helpful for students to refer to if there is a doubt in any of the case studies problems. The solutions from the Selfstudys website are easily accessible and free of cost to download. This accessibility can help students to download case studies from anywhere with the help of the Internet.

Human Eye and Colourful World Case Study Based Questions with solutions are in the form of PDF. Portable Document Format (PDF) can be downloaded through any of the devices: smart phone, laptop. Through this accessibility, students don't need to carry those case based questions everywhere.

Features of Human Eye and Colourful World Case Study Based Questions

Before solving questions, students should understand the basic details of Human Eye and Colourful World. Here are the features of case based questions on Human Eye and Colourful World are:

These case based questions start with short or long passages. In these passages some concepts included in the chapter can be explained.
After reading the passage, students need to answer the given questions. These questions are asked in the Multiple Choice Questions (MCQ).
These case based questions are a type of open book test. These case based questions can help students to score well in the particular subject.
These Human Eye and Colourful World Case Study Based Questions can also be asked in the form of CBSE Assertion and Reason .

Benefits of Solving Human Eye and Colourful World Case Study Based Questions

According to the CBSE board, some part of the questions are asked in the board exam question papers according to the case studies. As some benefits of solving Human Eye and Colourful World Case Study Based Questions can be obtained by the students. Those benefits are:

Through solving case studies students will be able to understand every concept included in the chapter Human Eye and Colourful World
Passages included in the case study are seen passages, so students don’t need to struggle for getting answers. As these questions and answers can be discussed by their concerned teacher.
Through these students can develop their observation skills. This skill can help students to study further concepts clearly.
Case studies covers all the concepts which are included in the Human Eye and Colourful World

How to Download Human Eye and Colourful World Case Based Questions?

Students studying in CBSE class 10 board, need to solve questions based on case study. It is necessary for students to know the basic idea of Human Eye and Colourful World Case Study Based Questions. Students can obtain the basic idea of case based questions through Selfstudys website. Easy steps to download it are:

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Class 10 Science: Case Study Chapter 11 The Human Eye and The Colourful World PDF Download

In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason . There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given.

Here we are providing you with Class 10 Science Chapter 11 The Human Eye and The Colourful World Case Study Questions, by practicing these Case Study and Passage Based Questions will help you in your Class 10th Board Exam.

Case Study Chapter 11 The Human Eye and The Colourful World

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 11 The Human Eye and The Colourful World

Case Study/Passage-Based Questions

Question 1:

(i) The splitting of white light can be done by

Answer: (b) prism

(ii) Which property of light is used by prism to form a spectrum?

Answer: (b) Refraction

(iv) When a red light passes through a prism, it (a) will not split (b) will split into seven colours (c) will split into white colour (d) will split into many different colours

Answer: (a) will not split

(v) The spectrum produced by the white light by a prism is called

Answer: (b) impure spectrum

Question 2:

(i) Due to atmospheric refraction, the apparent length of the day (a) increases (b) decreases (c) remains the same (d) all of these

Answer: (a) Due to atmospheric refraction, apparent length of the day increases by 4 minutes.

(ii) Apparent position of the star appears raised due to (a) atmospheric refraction (b) scattering of light (c) both (a) and (b) (d) none of these

Answer: (a) Apparent position of the stars appears raised due to atmospheric refraction.

(iii) The sun appears oval-shaped or flattened due to (a) dispersion (b) scattering (c) atmospheric refraction (d) cannot say

Answer: (c) atmospheric refraction

(iv) Twinkling of stars and non-twinkling of planets is accounted for by (a) scattering of light (b) dispersion of light (c) atmospheric refraction (d) none of these

(v) In absence of atmosphere, the colour of sky appears (a) blue (b) black (c) red (d) yellow

Answer: (d) yellow

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Case Study MCQ Questions Chapter 11 Human Eyes and Colourful World Class 10 Science

Please see below Case Study MCQ Questions Chapter 11 Human Eyes and Colourful World Class 10 Science. These MCQ Questions with Answers for Case study have been designed as per the latest syllabus and examination guidelines of Class 10 Science. Cased Study Based MCQ Questions for Class 10 Science are expected to come in the upcoming exams. We have provided a lot of case studies for all chapters in standard 10 science. Please solve the MCQ Questions and compare with the answers provided by our teachers.

Chapter 11 Human Eyes and Colourful World Class 10 Science Case Study MCQ Questions

The human eye is spherical in shape and has diameter of about 2.5 cm. Sclerotic is a tough, opaque and white substance forming the outermost coating of the eyeball. The front portion is sharply curved and covered by a transparent protective membrane called the ‘cornea’. Inner to the sclerotic there is a layer of black tissue called as choroids consisting of a mass of blood vessels, which nourishes the eye. The black colour does not reflect the light and hence rules out the blurring of image by reflection within the eyeball. Behind the cornea, the space is filled with a liquid called theaqueous humour and behind that a crystalline lens. ‘Iris’ is a muscular diaphragm lying between the aqueous humour and the crystalline lens. Iris has an adjustable opening in the middle called the pupil of the eye. The pupil appears black because all the light entering is absorbed by the ‘retina’, which covers the inside of the rear part of the ball. Iris controls the amount of light entering because the retina absorbs nearly all the light, which falls upon it. This is done by varying the aperture of the pupil with the help of the iris. In dim light the iris dilates the pupil so that more light can enter in. When the light is bright the pupil contracts. The crystalline lens divides the eyeball into two chambers. The chamber between the cornea and the lens is called the anterior chamber filled with a fluid called aqueous humour while the chamber between the lens and the retina is called the posterior chamber which is filled with a transparent gelatinous substance called vitreous humour. The refractive indices of the cornea, pupil lens and fluid portion of the eye are quite similar. So, when a ray of light enters the eye, it is refracted at the cornea. This refraction produces a real inverted and diminished image of distant objects on the retina. When the object is kept at different distances then, we may expect the image to be formed at different distances from the lens. It means, it may not form on the retina always. But in reality it is not so. Image is always formed on the retina. This is possible because the curvature of the crystalline lens is altered by ciliary muscles. When the eye is focused on infinity the muscles are relaxed and the eye lens remains thin. If the object is brought near by, the curvature increases so that the image can be formed on the retina. This property of the eye lens is called accommodation.

Question. The change in focal length of an eye lens to focus the image of objects at varying distances is done by the action of _______ (a) pupil (b) ciliary muscles (c) retina (d) blind spot

Question. The fluid between the retina and the lens is called ______ (a) aqueous humour (b) vitreous humour (c) aqua (d) humus

Question. The part of the eye where optic nerves enter the eye (a) pupil (b) ciliary muscles (c) retina (d) blind spot

Question. The inner back surface of the eyeball is called (a) pupil (b) ciliary muscles (c) retina (d) blind spot

The phenomenon of decomposition of the white light into its seven component colours when passing through a prism or through a transparent object delimited by non parallel surfaces is called dispersion of light. A beam of light containing all the visible spectrum of the light is white, because the sum of all the colors generates the white color. The light is decomposed in all the component colours, Violet, Indigo, Blue, Green, Yellow, Orange and Red, called as VIBGYOR. The band of the coloured components of a light beam is called its spectrum. The phenomenon can be explained by thinking that light of different colours (different wavelengths) has different velocities while travelling in a medium vm = f λm. Hence, the change in velocity of light observed when the light passes from the air to the glass, depends on the wavelength.

Question. When white light is allowed to pass through a glass prism, which colour deviates the most? (a) Indigo (b) Green (c) Red (d) Violet

Question. For a prism material, refractive index is highest for (a) Red (b) Yellow (c) Orange (d) Violet

Question. When white light is allowed to pass through a glass prism, which colour deviates the least? (a) Violet (b) Red (c) Green (d) Orange

Question. A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

Question. Which of the following statements is correct regarding the propagation of light of different colours of white light in air? (a) Red light moves fastest (b) Blue light moves faster than green light (c) All the colours of the white light move with the same speed (d) Yellow light moves with the mean speed as that of the red and the violet light

Dispersion is the splitting up of white light into seven colours on passing through a transparent medium like a glass prism. When a white light beam is passed through a prism, a band of seven colors are formed is known as spectrum of white light as shown in given figure. When white light consisting of seven colors falls on a transparent medium (glass prism), each color in it is refracted (or deviated) by a different angle, with the result that seven colors are spread out to form a spectrum.

Case Study MCQ Questions Chapter 11 Human Eyes and Colourful World Class 10 Science

Question. Which of the following colour of white light is least deviated by the prism? (a) green (b) violet (c) indigo (d) yellow

Question. A beam of white light falls on a glass prism. The colour of light which undergoes the least bending on passing through the glass prism is: (a) violet (b) red (c) green (d) blue

Question. The splitting up of white light into seven colours on passing through a glass prism is called: (a) refraction (b) deflection (c) dispersion (d) scattering

Question. The colour of white light which is deviated the maximum on passing through the glass prism is: (a) blue (b) indigo (c) red (d) orange

Question. The colour of white light which suffers the maximum bending (or maximum refraction) on passing through a glass prism is: (a) yellow (b) orange (c) red (d) violet

Atmosphere refraction is the phenomenon of bending of light on passing through earth’s atmosphere. As we move above the surface of earth, density of air goes on decreasing. Local conditions like temperature etc. also affect the optical density of earth’s atmosphere. On account of refraction, stars seen appear higher than they actual are; advanced sunrise; delayed sunset, oval appearance of the sun at sunrise and sunset; stars twinkle, planets do not.

Question. In absence of atmosphere, the colour of sky appears (a) blue (b) black (c) red (d) yellow

Question. The sun appears oval shaped or flattened due to (a) dispersion (b) scattering (c) atmospheric refraction (d) cannot say

Question. Twinkling of stars and non-twinkling of planets is accounted for by (a) Scattering of light (b) dispersion of light (c) atmospheric refraction (d) none of these

Question. Due to atmospheric refraction, apparent length of the day (a) increases (b) decreases (c) remains the same (d) all of these

Question. Apparent position of the star appears raised due to (a) atmospheric refraction (b) scattering of light (c) both (a) and (b) (d) none of these

The twinkling of a star is due to atmospheric refraction of starlight. The starlight on entering the earth’s atmosphere, undergoes refraction continuously before it reaches the earth. The atmospheric refraction occurs in a medium of gradually changing refractive index. Since the atmosphere bends starlight towards the normal, the apparent position of the star is slightly different from its actual position. The star appears slightly higher than its actual position when viewed near the horizon. Further this apparent position of the star is not stationary, but keeps on changing slightly, since the physical conditions of the earth’s atmosphere are not stationary. Since the stars are very distant they are approximate pointsized source of light. As the path of rays of light coming from the star goes on varying slightly, the apparent position of the star fluctuates and the amount of starlight entering the eye flickers the stars sometimes appear brighter and at some other time, fainter, which is the twinkling effect.

Question. At noon, the Sun appears white as: (a) Light is least scattered. (b) All the colours of the white light are scattered away. (c) Blue colour is scattered the most. (d) Red colour is scattered the most.

Question. Which of the following statements is correct regarding the propagation of light of different colours of white light in air? (a) Red light moves with the fastest speed. (b) Blue light moves faster than green light. (c) All the colours of the white light move with the same speed. (d) Yellow light moves with the mean speed as that of the red and the violet light.

Question. The stars seem higher than they actually are due to: (a) Reflection of light (b) Refraction of light (c) Scattering of light (d) Inference of light

Question. Which of the following phenomenon of light is involved in the formation of rainbow? (a) Reflection, refraction and dispersion (b) Refraction, dispersion and total internal reflection. (c) Refraction, dispersion and internal reflection. (d) Dispersion, scattering and total internal reflection.

Question. Stars appear to twinkle because of: (a) Atmospheric refraction (b) Movement of air (c) Both (a) and (b) (d) None of these

A prism is a transparent refracting medium bounded by two plane surfaces inclined to each other at a certain angle. The refraction of light through a prism, follows the laws of refraction. In the prism refraction takes place on its refracting surface it means when the light enters the prism and when the light leaves the prism. The refraction through a prism is shown. Here A is the angle of prism, ∠i is the angle of incidence of the face AB and ∠e is the angle of emergence at other face AC. The incident ray suffers a deviation or bending through an angle δ due to the refraction through prism. This angle is called angle of deviation as shown in figure.

∠i + ∠e = ∠δ + ∠A

Question. When a ray is refracted through a prism, then (a) ∠i = ∠δ (b) ∠i = ∠e + ∠δ (c) ∠ = ∠e (d) ∠i > ∠r

Question. The rectangular surfaces of a prism are know as: (a) reflecting surfaces (b) dispersing surfaces (c) refracting surfaces (d) none of these

Question. The angle of deviation depends on (a) refraction index of prism (b) angle of incidence (c) both (a) and (b) (d) none of these

Question. The angle between the two refracting surfaces of a prism is called ____________. (a) angle of prism (b) angle of incidence (c) angle of deviation (d) angle of emergence

Question. The angle between the incident ray and the emergent ray is called ____________. (a) angle of emergence (b) angle of deviation (c) angle of incidence (d) none of these

Question. The colour of sky appears blue, it is due to the (a) refraction of light through the atmosphere (b) dispersion of light by air molecules (c) scattering of light by air molecules (d) all of these

Question. To an astronaut in a spaceship the colour of earth appears (a) red (b) blue (c) white (d) black

Question. The danger signs made red in colour, because (a) the red light can be seen from farthest distance (b) the scattering of red light is least (c) both (a) and (b) (d) none of these

Question. At the time of sunrise and sunset, the light from sun has to travel through ____________. (a) longest distance of atmosphere (b) shortest distance of atmosphere (c) both (a) and (b) (d) can’t say

Question. At the time of sunrise and sunset (a) Blue colour scattered and red colour reaches our eye. (b) Red colour scattered and blue colour reaches our eye. (c) Green and blue scattered and orange reaches our eye. (d) None of these.

The ciliary muscles of eye control the curvature of the lens in the eye and hence can alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained the curvature of lens increases (that means radius of curvature decreases) and focal length decreases. For a clear vision the image must be on retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye-lens. It is about 2.5 cm for a grown-up person. A person can theoretically have clear vision of objects situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possiblefocal length. The ciliary muscles are most strained in this position. For an average grown-up person minimum distance of object should be around 25 cm. A person suffering for eye defects uses spectacles (Eye glass). The function of lens of spectacles is to form the image of the objects within the range in which person can see clearly. The image of the spectacle-lens becomes object for eye-lens and whose image is formed on retina. The number of spectacle-lens used for the remedy of eye defect is decided by the power of the lens required and the number of spectacle-lens is equal to the numerical value of the power of lens with sign. For example power of lens required is +3D (converging lens of focal length 100/3 cm) then number of lens will be +3. For all the calculations required you can use the lens formula and lens maker’s formula. Assume that the eye lens is equiconvex lens. Neglect the distance between eye lens and the spectacle lens.

Question. A nearsighted man can clearly see object only upto a distance of 100 cm and not beyond this. The number of the spectacles lens necessary for the remedy of this defect will be (a) +1 D (b) –1 D (c) + 3 D (d) – 3 D

Question. Minimum focal length of eye lens of a normal person is (a) 25 cm (b) 2.5 cm (c) 25/9 cm (d) 25/11 cm

Question. Maximum focal length of eye lens of normal person is (a) 25 cm (b) 2.5 cm (c) 25/9 cm (d) 25/11 cm

Case Study MCQ Questions Chapter 11 Human Eyes and Colourful World

Case study chapter 6 triangles mathematics, assignments class 10 mathematics polynomials, assignments class 10 social science democracy and diversity.

Case Based Questions Test: The Human Eye & the Colourful World - Class 10 MCQ

10 questions mcq test - case based questions test: the human eye & the colourful world, a narrow beam of white light is passing through a glass prism as shown in the diagram. study the diagram and answer the questions. the phenomenon observed in above set-up is.

A. scattering of light
B. dispersion of light
C. reflection of light
D. refraction of light

A narrow beam of white light is passing through a glass prism as shown in the diagram. Study the diagram and answer the questions. In nature, this phenomenon is observed in

A. Formation of rainbow
B. Twinkling of stars
C. Blue colour of sky
D. Advance sunrise

A narrow beam of white light is passing through a glass prism as shown in the diagram. Study the diagram and answer the questions. Which of the following statement is correct about constituents of white light based on above observations?

White light consists of seven colours.

Violet colour suffers minimum deviation.

Red light suffers maximum deviation.

All the colours of the white light move with different speed in vacuum.

When the light disperses, various bands of light are clearly visible. It is clear from the figure that the violet light suffers maximum deviation and red light suffers minimum deviation. All the colours of the white light move with the same speed in air or vacuum but with different wavelengths and frequencies.

A narrow beam of white light is passing through a glass prism as shown in the diagram. Study the diagram and answer the questions.

The cause of dispersion of light is

A. All the colors of light travel with the speed more than the speed of light.
B. All the colors have different angles of deviation.
C. All the colors do not travel with the same speed of light.
D. All the colors have the same wavelength .

Read the following statements carefully and choose the correct ones

(I) The prism behaves the same as that of a rectangular glass slab.

(II) All the colours have different angles of deviation in case of dispersion through prism.

(III) All the colours travel with the same speed of light in glass.

(IV) Dispersion of light is observed in the case of rectangular glass slabs.

I and II only

I, II and IV only

All of the above

A prism is made up of glass in which the faces are joined at a certain angle but in the case of a rectangular glass slab, the opposite faces are parallel to each other. As the light enters in the prism, all the colours travel with the different speed of light because glass is a denser medium as compared to air and dispersion of light is not observed in case of a rectangular glass slab. So, both the prism and rectangular glass slab behave differently.

Read the passage in the human eye and answer the questions.

Eye is a natural optical device by which humans could see objects around him. It forms an inverted, real image on a light sensitive surface. It works on the phenomenon of refraction of light through a natural convex lens. However, Meena was unable to see clearly the words written on the black board placed at a distance of approximately 3 m from her. Her mother discussed the same with the doctor. Doctor explained to her about this defect of vision and its correction.

The human eye forms the image of the object at its

What kind of defect Meena is suffering from?

B. Hypermetropia
C. Astigmatism
D. Malnutrition

The possible cause this defect is

A. eyeball is of same size
B. eyeball becomes long
C. eyeball becomes small
D. None of the above

The closest distance up to which a person can see without any strain in the eyes

The defective eye of a person has near point 0.5 m and far point as 3 m. The power of both lens required for reading purpose and seeing far off objects is

A. 0.75 D and +4 D
B. +2D and – 1/3 D
C. – 2.5D and + 1/8D
D. 0.85 D and – 2 D

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Important Questions for Case Based Questions Test: The Human Eye & the Colourful World

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CBSE Class 10 Physics Human Eye Important Questions and Answers for 2023

Cbse class 10 physics human eye important questions and answers by subject experts so that students are well prepared with all major questions that can be asked in cbse class 10 science board examination 2022-23.

CBSE Class 10 Physics Human Eye Important Questions and Answers: With the help of the important questions and answers to the chapter Human Eye and Colourful World, students in CBSE Class 10 can achieve their dream scores in the Science board examination. These questions have been listed along with the best answers by subject experts so that students are well prepared with all major questions that can be asked in CBSE Class 10 Science board examination 2022-23.

CBSE Class 10 Important Questions on Science Chapter- Human Eye and Colourful World

Multiple choice questions.

1. Colour of sky appears blue, due to the

(A) atmospheric refraction

(B) presence of plants in water

(D) none of these

2. Twinkling of stars is due to

(a) Reflection of light by clouds

(b) scattering of light by dust particles

(d) atmospheric refraction of starlight

3. Red colour is used as danger sign as

(A) red colour scattered least by smoke

(B) red colour scattered most by smoke

(D) red colour moves fast in air

4. The scattering of light by colloidal particles is called

(a) Tyndall effect

(b) dispersion

(d) internal reflection

5. Which colour of light refracts most when passes through a prism-

(A) yellow

(B) Red

6. Which of the following controls the amount of light entering the eye

(A) pupil

(B) iris

7. When white light passes through a prism, the component colour which Undergoes maximum bending is

(a) red

(b) green

8. The change of focal length of eye lens is caused by the action of the

(A) ciliary muscles

9. Sunlight is passed through a transparent medium having very fine particles These particles scatter light.Which among the given components of light undergoes more scattering?

(b) orange

10 The least distance of distinct vision for a young adult with normal vision is about

(a) 25 m

(b) 2.5 cm

ASSERTION AND REASON BASED QUESTIONS

Instructions: A statement of assertion followed by a statement of reason is

given.Choose the correct answer out of the following choices.

(A) Both Assertion and Reason are true and the reason is the correct explanation of assertion.

(B) Both Assertion and Reason are true and the reason is not the correct explanation of assertion.

(D) Assertion is false but Reason is true.

1. Assertion:A rainbow is a natural spectrum appearing in the sky after a

Rain Shower.

Reason- A rainbow is always formed in a direction opposite to that of theSun.

2. Assertion- myopia is called far-slightness

Reason- myopia is corrected by using a concave lens in front of eye lens

3. Assertion: When a beam of light strike fine particles of smoke, the path of the beam becomes visible.

Reason :Fine particles of smoke scatter light.

4. Assertion: White light is dispersed into its seven-colour components by a prism.

Reason : Different colours of light bend through different angles with respect tothe incident ray, as they pass through a prism.

5. Assertion: The stars twinkle, while the planets do not.

Reason: The stars are much bigger in size than the planets.

6. Assertion- cataract can be corrected by using bi-focal lens.

Reason – The crystalline lens of old peoples become milky and cloudy; this is due to the age of person.

7. Assertion- atmospheric refraction is responsible for advance sunrise and delayed sunset.

CASE STUDY BASED QUESTIONS

One of nature's most splendid masterpieces is the rainbow. A rainbow is an excellent demonstration of the dispersion of light and one more piece of evidence that visible light is composed of a spectrum of wavelengths, each associated with a distinct colour. To view a rainbow, the sun must be at your back as you look at an approximately 40 degree angle above the ground into a region of the atmosphere with suspended droplets of water or even a light mist. Each individual droplet of water acts as a tiny prism that both disperses the light and reflects it back to your eye.

i) Formation of rainbow involves some natural phenomena which are in the correct order respectively is

a)refraction, dispersion, internal reflection and refraction

b)refraction, dispersion, internal reflection

c)reflection, refraction ,dispersion and refraction

d) dispersion , reflection, refraction and internal reflection

ii) During the formation of a rainbow the position of observer and sun is

a) Observer behind sun

b) sun behind the observer

b) Observer facing sun

d) at any position

iii) During the formation of rainbow, dispersion of sunlight is done by

a) tiny air molecules

b) dust particles of atmosphere

c) tiny droplets of rain water suspended in air

d) air and water

iv)The dispersion of light into its components by prism is due to

a) each component get deviated by the same angle by refraction

b) each component gets deviated by a different angle by refraction

c)reflection of each component light by different angle

When a ray of light incident on a prism it will split in seven colours that is called dispersion of light. A prism is a transparent refracting body bounded by plane faces which are inclined to each other at a particular angle called angle of prism.. When a ray of light passes through a prism, it suffers refraction twice and hence the ray deviates through a certain angle from its original path. The angle between the incident ray and emergent ray is called angle of deviation.

i . For which colour the angle of deviation is minimum?

a Red

c Violet

ii When a white light falls on a prism, the ray at its surface suffers:

(A) Refraction only

(B) dispersion only

(D) all of above

iii In nature, dispersion of light is happening in

(A) Blue colour of sky

(B) Formation of rainbow

(D) advance sunrise

iv The cause of dispersion of light is –

(A) All colours of light travel with the speed more than the speed of light

(B) All colours have different angle of deviation

VERY SHORT ANSWER QUESTIONS

1. What is meant by the power of accommodation of the eye ?

2. When a monochromatic light having only one wavelength, passes through a prism, will it show dispersion?

3. Name the component of white light that deviates the least while passing through a glass prism.

4. A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from ? How can it be corrected?

5. A student has difficulty reading the blackboard while sitting in the front row. What could be the defect the child is suffering from ? How can it be corrected?

6. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision ?

7. Name the component of white light that deviates the most while passing through a glass prism.

SHORT ANSWER QUESTIONS

1. What is colour-blindness? What kind of retinal cells are lacking in a person suffering from this defect?

2. What happens to the image distance in the eye when we increase the distance of an object from the eye ?

3. Explain why the planets do not twinkle?

4. Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

5. Why do stars twinkle?

6. Why does the sky appear dark instead of blue to an astronaut?

LONG ANSWER TYPE QUESTIONS

1. State the reason behind the following phenomenon/observation:

A. Rainbow formation

B. Reddening of sun’s disc in the early morning and late evening

C. Flattening of sun’s disc at sunrise and sunset

D. Pathway of light visible in a foggy atmosphere or a dusty room/smoke filled room

2 . How can we see objects?

3. The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

Answers to the important Questions on Science Chapter- Human Eye and Colourful World

Answer: The power of accommodation of the eye is the maximum variation of its power for focusing on near and far (distant) objects.

Answer: No, it will not show dispersion. It will only show deviation.

Answer: Least deviated component: Red

Answer: The child is suffering from myopia. The child should use concave lens of suitable focal length.

Answer: The child is suffering from hypermetropia. The child should use convex lens of suitable focal length.

Answer: Concave lens.

Answer: Most deviated component: Violet

8. What is the far point and near point of the human eye with normal vision ?

Answer: The defect of the eye due to which a person is unable to distinguish between certain colours, is known as colour blindness. Cone-shaped retinal cells are responsible for making a person differentiate between colours. The colour blindpersons do not possess cone cells that respond to certain colours.

Answer: The eye lens of a normal eye forms the images of objects at various distances on the same retina. Therefore, the image distance in the eye remains the same.

Answer: The planets are much nearer to the earth than stars and because of this they can be considered as large source of light. If a planet is considered to be a collection of a very large number of point sources of light, then the average value of change in the amount of light entering the eye from all point size light sources is zero. Due to this the effect of twinkling is nullified.

Ans: A normal eye is unable to clearly see objects placed closer than 25 cm because the ciliary muscles of eyes are unable to contract beyond a certain limit. If the object is placed at a distance less than 25 cm from the eye, then the object appears blurred and produces strain in the eyes.

Answer: Stars appear to twinkle due to atmospheric refraction. The light of a star after the entry of light in earth’s atmosphere undergoes refraction continuously till it reaches the surface of the earth. Stars are far away. So, they are the point source of light. As the path of light coming from stars keeps changing, thus the apparent position of stars keeps changing and the amount of light from stars entering the eye keeps twinkling. Due to which a star sometimes appears bright and sometimes dim, which is the effect of twinkling.

Answer: As an astronaut moves away from the atmosphere of earth, the atmosphere becomes thin. Due to the absence of molecules (or dust particles) in air, the scattering of light does not take place. Thus, the sky appears dark in the absence of scattering.

7. Why does the sun appear reddish early in the morning?

Rainbow formation
Reddening of sun’s disc in the early morning and late evening
Flattening of sun’s disc at sunrise and sunset
Pathway of light visible in a foggy atmosphere or a dusty room/smoke filled room

Answer: A. Light when enters tiny raindrops in the atmosphere, undergoes Refraction,dispersion,internal reflection,again refraction

B. Scattering away of smaller wavelength of light by particles of atmosphere

C. Atmospheric refraction

D. Tyndall effect/scattering of light

Answer: - First light enters in our eye from cornea. If the light is very bright, the iris contracts the pupil to allow less light to enter the eye and in dim light the iris expends pupil to allow more light in the eye. This light incident on the eye lens and image is formed at the retina. The optic nerves transmit electrical impulses to the brain and we get information about the object.

3. The far point of a myopic person is 80 cm in front of the eye. What is thenature and power of the lens required to correct the problem?

Answer: The person is suffering from an eye defect called myopia. In this defect, the image is formed in front of the retina.

Hence, a concave lens is used to correct this defect of vision.

Object distance, u = infinity

Image distance, v = −80 cm

Focal length = f

According to the lens formula, 1/v-1/u=1/f

1/-80 -1/α =1/f

P= 1/f= 1/-0.8 =-1.25D

A concave lens of power −1.25 D is required by the person to correct his defect.

4. Draw the sketch diagram of the human eye. And explain about the different parts of the eye.

Answer: The human eye is the most sensitive part of the human body. By closing our eyes, we can sense some objects with their smell, taste, sound they make or by touching them but we cannot identify the colour without opening our eyes.

CBSE Class 10 Physics Human Eye Important Questions and Answers

Parts of human eyes: -

Cornea- the outermost part of the eye, light enters from this part.

Eye lens- it is a convex lens its curvature is controlled by ciliary muscles.

Iris- The part of the eye which controls the size of the pupil.

Pupil- The aperture of the pupil varies with the help of the iris. Pupil regulates and controls the amount of light entering the eye.

Retina- The light-sensitive screen, where the image of any object is formed

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Human Eye and Colourful World Class 10 Important Questions with Answers | CBSE Science Chapter 11 (2024-25)

CBSE Class 10 Science Chapter-11 Important Questions with Answers- Free PDF Download

Vedantu’s important questions on CBSE Class 10 Science Chapter 11 - Human Eye and Colourful World will help students achieve their dream scores in their Class 10 Science exams b y preparing them with the best quality answers to all the major questions that can be asked in the test.

This chapter focuses on the human eye and its various functions for humans and how it helps us in our day-to-day life. It's vital that students must utilise this point of time to review hard and these important questions will help students to revise better and re-evaluate the most points within the chapter. It's of grave importance that students be aware of the important questions which have a high potential of coming within the exams. Students who don’t understand the subject alright must study these questions of sophistication for Class 10 so that students can have a better understanding of the chapter and also know what are the important topics to specialise in.

Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students . You can download Class 10 Maths NCERT Solutions to help you to revise the complete syllabus and score more marks in your examinations.

Download CBSE Class 10 Science Important Questions 2024-25 PDF

Also, check CBSE Class 10 Science Important Questions for other chapters:

Related Chapters

Important Topics under CBSE Class 10 Science Chapter 11 - Human Eye and Colourful World

The following is a list of all the important topics that are covered under the chapter on Human Eye and Colourful World:

Introduction to The Human Eye and Colourful World

Structure of a Human Eye

Defects of a human eye, dispersion of white light by a glass prism, atmospheric refraction, twinkling of stars, scattering of light, study important questions for class 10 science chapter 11 - human eye and colourful world, very short answer questions (1 mark).

1. When a person is myopic, he/ she can clearly see

Both nearby and far-off objects

Only nearby objects

Only far-off objects

Neither near nor far off objects

Ans: b. Only nearby objects

2. The defect of myopia can be corrected by using

Concave lens

Convex lens

Either concave or convex

A complicated combination of lenses.

Ans: a. Concave lens

3. The colour that is scattered the least by the tiny particles and the atoms/ molecules of the atmosphere is

Green

Yellow

Ans. d. Red

4. Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

Dispersion of light

Scattering of light

Total internal Reflection

Reflection of light from the earth

Ans: b. Scattering of light

5. The focal length of the eye lens increases when eye muscles.

are relaxed and lens becomes thinner

contract and lens becomes thicker

are relaxed and lens becomes thicker

Contract and lens become thinner.

Ans: a. are relaxed and lens becomes thinner

6. Define the power of accommodation?

Ans: The power of the eye lens to focus on objects near or far from the retina by adjusting its focal length is called the power of accommodation.

7. Which part of the human eye provides most of the refraction for the light rays entering the eye?

Ans: Cornea and Aqueous humour provides most of the refraction for the light rays entering the eye.

8. What happens to the image distance in the eye when we increase the distance of an object from the eye?

Ans: When the distance of an object from the eye is increased, the image distance remains the same and the image is formed on the retina of the eye.

9. What happens to the pupil of the eye when the light is very bright?

Ans: When the light is very bright, the pupil’s size becomes smaller and limits the extent of light entering the eye.

10. Which part of the human eye conveys the electrical signals generated by the light sensitive cells of the retina to the brain?

Ans: Optic nerves convey the electrical signals generated by the light sensitive cells of the retina to the brain.

11. The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to

Accommodation

Near-sightedness

Far-sightedness

Ans: b. Accommodation

12. The human eye forms the image of an object at its

Ans: d. Retina

13. The least distance of distinct vision for an eye lens is caused by the action of the

Ans: c. $25$ cm

14. The change in focal length of an eye lens is caused by the action of the

Ciliary muscles

Ans: c. Ciliary muscles

15. What would have been the colour of the sky if there had not been any atmosphere around the earth?

Ans: The colour of the sky would be black if there had not been any atmosphere around the earth.

16. For dispersion of light through a prism which colour has a maximum deviation?

Ans: Violet has the maximum deviation for dispersion of light through a prism.

17. What is the least distance of distinct vision of a normal human eye?

Ans: The least distance of distinct vision of a normal human eye is $25$ cm.

18. Name the muscle responsible for bringing change in the focal length of the eye lens?

Ans: Ciliary muscles are responsible for bringing change in the focal length of the eye lens.

19. Name one defect of vision which cannot be corrected by any type of spectacle lens?

Ans: Cataract, clouding of the lens of the eyes is a vision defect that cannot be corrected by any type of spectacle lens.

20. State one effect produced by the scattering of light by the atmosphere?

Ans: Tyndall effect is produced by the scattering of light by the atmosphere.

21. What is the nature of the image formed on the retina of the eye?

Ans: The image formed on the retina of the eye is real and inverted.

22. What type of lens is used for correcting hypermetropia?

Ans: Convex lens is used to rectify hypermetropia or long-sightedness.

23. Who was the first person to obtain the spectrum of sunlight?

Ans: Sir Isaac Newton was the first person to obtain the spectrum of sunlight.

24. As light rays pass from air into glass prisms, are they refracted towards or away from the normal?

Ans: As light rays pass from air into a glass prism they are refracted towards the normal as glass is denser than air.

25. Which colour has the largest wavelength?

Ans: Red colour of light has the longest wavelength in the visible spectrum of light.

26. Which defect of vision can be rectified using a concave lens?

Ans: Myopia (short-sightedness) can be rectified using a concave lens.

27. What phenomenon causes the twinkling of stars on a clear night?

Ans: Atmospheric refraction is the phenomenon that causes the twinkling of stars on a clear night.

28. What is meant by scattering of light?

Ans: Scattering of light is defined as the change in the direction of light on striking an obstacle such as dust, water vapour, etc.

Short Answer Questions (2 Marks)

1. The far point of a myopic person is $80$ cm in front of the eye. What is the nature and power of the lens required to correct the problem?

Ans: The far point of a myopic person is given as $80$ cm.

Since the person is Myopic, the lens would be concave and the focal length will be negative.

$\Rightarrow f=-80\text{ }cm=-0.8\text{ }m$

We know, the power of a lens is equal to the reciprocal of the focal length.

$\Rightarrow P=\dfrac{1}{f}$

$\Rightarrow P=\dfrac{1}{-0.8}=-1.25D$

The nature of the lens is concave and its power is $-1.25D$.

2. Draw a diagram to show the dispersion of white light by a glass prism.

Ans: Diagram depicting the dispersion of white light by a glass prism is drawn below.

Diagram showing dispersion of white light by glass prism

3. Name the phenomenon responsible for the observed twinkling of stars. Will this twinkling be observed by an observer on the moon?

Ans: The phenomenon responsible for the twinkling of stars is atmospheric refraction.

Since the moon has no atmosphere, the observer on the moon will not be able to observe the twinkling of stars.

4. Name the part of the eye that

determines the colour of a person’s eye

Controls the amount of light entering the eye

5. What is the role of the ciliary muscles?

Ans: The main role of the ciliary muscles is to hold the eye lens in its position. The ciliary muscles contract and relax to focus on near or far away objects by changing the shape of the eye lens which in turn increases or decreases the focal length of the eye lens.

6. Why is a convex lens called a converging lens?

Ans: A convex lens focuses all the parallel light rays at its focus after refraction. Hence, it is called a converging lens.

7. State the role of the eye lenses in the human eye?

Ans: The eye lens focuses the light rays entering the eye on the retina forming a real and an inverted image of the object on the retina.

8. A person with a myopic eye cannot see objects beyond $1.2$ m distinctly. What should be the corrective lens used to restore proper vision?

Ans: Since the person is myopic and cannot see objects clearly beyond $1.2$ m, he should use a concave lens having a focal length $1.2$ m to restore his normal vision.

9. What is the far point and near the point of the human eye with normal vision?

Ans: For a human eye with proper vision, the near point is $25$ cm from the eye and the far point is at infinity.

10. A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

Ans: Since, the student has difficulty reading the blackboard, sitting in the last row, he is suffering from myopia or short-sightedness. A concave lens of suitable power should be used to correct his vision defect.

11. Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

Ans: The normal eye is unable to see the objects clearly placed closer than $25$ cm because at a distance of $25$ cm power of accommodation gets exhausted. Hence, the eye is unable to focus the light rays on the retina, when the object is placed closer than $25$ cm.

12. Why does the Sun appear reddish early in the morning?

Ans: During sunrise, the sun is at the farthest distance from the earth’s surface. The light rays travel a large distance in the Earth’s atmosphere before reaching our eyes.

While passing through the atmosphere, the light rays with shorter wavelengths get scattered by the Earth’s atmosphere and the red-colored light with the longest wavelength is able to reach our eyes. Hence, the Sun appears reddish early in the morning.

13. A person wears eyeglass of focal length $70$ cm. What is the far point of the person?

Ans: The focal length of the eye glass is given as,

$\Rightarrow f=-70$ cm

$\Rightarrow u=-\infty $

From the lens formula, we have:

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

$\Rightarrow \dfrac{1}{-70}=\dfrac{1}{v}-\dfrac{1}{-\infty }$

$\Rightarrow \dfrac{1}{-70}=\dfrac{1}{v}$

$\Rightarrow v=-70$ cm

Hence, the far point of the person will be $70$ cm.

14. If your eyeglasses have a focal length $60$ cm what is your near point?

$\Rightarrow f=60$ cm

$\Rightarrow u=-25$ cm

$\Rightarrow \dfrac{1}{60}=\dfrac{1}{v}-\dfrac{1}{-25}$

$\Rightarrow \dfrac{1}{60}-\dfrac{1}{25}=\dfrac{1}{v}$

$\Rightarrow v=-43$ cm

Hence, the near point will be $43$ cm.

15. Why do we observe random wavering or flicking of the objects near a fire or on a very hot day?

Ans: We observe random wavering or flicking of the objects near a fire or on a very hot day because of atmospheric refraction. The area above the fire is hot and is lighter than the cool air above it due to which its refractive index is low and density also does not remain the same. Therefore, the apparent position of the object flickers.

16. Why are we not able to see things clearly when we come out of a dark room?

Ans: In a dark room, the iris expands the pupil which allows more light to enter the eye. As we come out of the darkroom, a large amount of light enters our eyes and because of the glare, we are not able to see things clearly.

17. What is the function of the optic nerve in the human eye?

Ans: Optic nerve carries the visual information from the retina to the brain in the form of electrical signals.

18. Why do different colours deviate through different angles on passing through a prism?

Ans: Different colours deviate through different angles on passing through a prism because different colours with different wavelengths travel through glass at different speeds and the glass has a different refractive index for different colours.

19. Name the defect of vision in the person

a. Whose near point is more than $25$ cm away?

Ans: Hypermetropia

b. Whose far point is less than infinity.

Ans: Myopia

20. What is a spectrum?

Ans: A continuum of colour obtained by dispersion of white light by passing through a prism is called a spectrum.

21. Why does the clear sky look blue?

Ans: As white light passes through the atmosphere, the tiny particles held in the atmosphere scatter the light of a shorter wavelength. Therefore, blue light having the shortest wavelength is scattered the most and the clear sky appears blue.

22. Can visible light be scattered by atoms/molecules in the earth’s atmosphere?

Ans: Yes, visible light is scattered by atoms/molecules in the earth’s atmosphere as the size of molecules/atoms is much less than the wavelength of visible light.

23. Why does the sky appear dark instead of blue to an astronaut?

Ans: Outer space does not have an atmosphere. As a result, the light does not scatter into its constituent colours in outer space and hence the sky appears dark instead of blue to an astronaut .

24. What is the basic cause of atmospheric refraction?

Ans: Atmospheric refraction is caused by the bending of light when it passes through the layers of the Earth’s atmosphere with different optical densities.

25. What is the range of vision?

Ans: The range of vision of a normal human eye is the distance between the near point and far point of the human eye. Hence, for a normal human eye, it ranges from $25$ cm to infinity.

Short Answer Questions (3 Marks)

1. Explain in brief:

a. What is hypermetropia?

Ans: Hypermetropia (long-sightedness) is a vision defect where nearby objects appear blurred but the distant objects can be seen clearly.

b. What are the two causes of this defect of vision?

Ans: The two possible causes of this defect are:

(i). An increase is the focal length of the eye lens or the power of the eye lens decreases

(ii). Size of the eyeball decreases

2. Explain the scattering of light?

3. A person is known to use a lens of power

$-5.5$ D for his distant vision

$+1.5$ D for his near vision

Calculate the focal length of the lens used for correcting his

Distant vision

Ans: For distant vision, the power of lens is given to be $-5.5$ D.

The focal length is given by,

$\Rightarrow f=\dfrac{1}{P}$

$\Rightarrow f=\dfrac{1}{-5.5}$ m

$\Rightarrow f=-18.2$ cm

Near vision problems.

Ans: For near vision, the power of the lens is given to be $+1.5$ D.

$\Rightarrow f=\dfrac{1}{1.5}$ m

$\Rightarrow f=66.7$ cm

4. What is presbyopia? State the causes of this defect? How is the presbyopia of a person corrected?

Ans: Presbyopia is a visual impairment mainly due to aging when a person is unable to see the near and far off objects clearly.

The main causes of presbyopia are as follows:

Stiffness of the eye lens

Due to aging, the power of accommodation of the eye may decrease.

The ciliary muscles become weak.

Presbyopia is corrected using a bifocal lens whose upper half has a concave nature and the lower half a convex nature.

5. The rainbow is a natural spectrum appearing in the sky after a rain shower.

a. Is it correct to say that a rainbow is always formed in a direction opposite to the sun?

Ans: Yes, a rainbow is always formed in a direction opposite to the sun as a rainbow is just the sunlight that has been refracted and reflected.

b. Can it be seen on a sunny day?

Ans: Yes, a rainbow can be seen on a sunny day if the Sun’s beam passing through the droplets of water suspended in the atmosphere, reaches the observer’s eye.

c. Arrange the sequence in correct sequential order Refraction, Internal Reflection, Refraction & Dispersion.

Ans: The correct sequential order is:

Refraction & Dispersion, Internal Reflection, Refraction.

Show a diagram to show the correctness of hypermetropia?

Ans: Diagram to show the correctness of hypermetropia is shown below,

Diagram showing correction for Hypermetropia

7. A reporter records the following observations of an astronaut from his spaceship. Justify each statement.

a. The length of the day is the same as observed on the earth.

Ans: This statement is not true as the length of the day in space can be four minutes shorter than on Earth.

b. Space appears black in colour.

Ans: The statement is correct because in space there is no atmosphere. Hence, there is no scattering of light.

c. The star appears to twinkle while the planets do not do so as they do on the earth.

Ans: The statement is incorrect since we know that the twinkling of stars is due to atmospheric refraction and space has no atmosphere. Hence, the stars do not appear to twinkle in space.

8. Why do stars twinkle?

Ans: Twinkling of stars is due to the atmospheric refraction of light. Stars behave as point sources of light since they are present far away. The path of the light rays from the star experiences atmospheric refraction and the position of the star appear to change. Also, the amount of light entering the eye flickers, so sometimes the star appears brighter and at other times fainter. Thus, the stars twinkle.

9. Explain why the planets do not twinkle.

Ans: The planets are much closer to the earth than the stars. A planet can be considered a collection of a large number of limited light sources. Although light comes from individual point sources flickering, the total amount of light that enters our eye from all of the individual point sources will be the same. Thus, the planets appear equally brighter and there are no planetary blinks.

10. A certain person has a minimum distance of distinct vision of $150$ cm. He wishes to read at a distance of $25$ cm. What focal length glass should he use? What is the nature of eye defects?

Ans: Given,

$\Rightarrow v=-150$ cm

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{-150}-\dfrac{1}{-25}$

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{30}$

$\Rightarrow f=30$ cm

Since the focal length is positive, the lens used is a convex lens.

Hence, the eye defect is Hypermetropia.

Long Answer Questions (5 Marks)

1. A $14$-year-old student is not able to clearly see the questions written on the blackboard placed at a distance of $5$ m from him.

a. Name the defect of vision he is suffering from?

Ans: The student is suffering from myopia.

b. Draw the diagram to show this defect?

Ans: The diagram showing the myopic defect is drawn below.

c. Name the type of lens used to correct this defect?

Ans: A concave lens is used to correct myopia.

d. Name two possible causes of this defect.

Ans: The two possible causes of myopia are:

i. Elongation of the eyeball

ii. Decrease in the focal length of the eye lens

e. Draw the diagram to show how this defect can be corrected.

Ans: The diagram showing how myopic defect is corrected is drawn below.

Diagram showing correction for Myopic defect

2. Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is $1$ m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is $25$ cm.

Ans: The diagram showing the correction of hypermetropia is drawn below.

Near point of a hypermetropic eye is 1 m and that of a normal eye is 25 cm.

$\Rightarrow v=-1\text{ m = }-100\text{ cm}$

$\Rightarrow \dfrac{1}{f}=\dfrac{1}{-100}-\dfrac{1}{-25}$

$\Rightarrow f=\dfrac{100}{3}\text{ cm = }\dfrac{1}{3}\text{ m}$

$\Rightarrow P=\dfrac{1}{\left( \dfrac{1}{3} \right)}$ D

$\Rightarrow P=+3.0\text{ D}$

Chapter 11 Science Class 10 Important Questions - Free PDF Download

This chapter is crucial in science class 10 since it contains a lot of information. This chapter gives students information on how to prepare for exams and the appropriate quantity of study material to help them revise this topic on the human eye. Students will study about the human eye, different types of lenses, the light spectrum, and the numerous sorts of eye disorders that people experience, as well as how to remedy these problems. Students will study about the human eye and its different components, including the role of cones and rods.

The notes for this chapter are simply accessible on the Vedantu website. Students may view the human eye class 10 critical questions at any time on the Vedantu website. Students may either download it in pdf format or convert it to doc format. Students can also print these questions for ease of study because gazing at a screen all day can be exhausting, and using a computer can be quite distracting.

CBSE Class 10 Science Chapter 11 Important Concepts

This chapter is quite vast and covers a lot of concepts on the human eye and the colourful world. So for students to get a better idea of the chapter, they can look at the following important concepts -

Ciliary Muscles

The ciliary muscles are the muscles that hold the eye in its position and when the muscles relax and contract, they change the shape of the eye lens which in turn changes the focal length of the eye as it can increase and decrease based on the brain's instructions.

Power of Accommodation of the Eye

This is the power of the eye to change its focal length, and this is done to focus on the rays coming on the retina and the objects that are close by, and this is based on several factors.

The limit of power of accommodation shows that the focal length of the eye cannot be decreased to a certain limit. The near point of the eye is when the eye cannot see the objects that are placed closer than a certain minimum distance.

Sun Appear Reddish in the Morning

The reason why the sun appears reddish in the morning is that in the early morning the sun is placed on the horizon. Light from the sun passes through thicker layers of air, and all these layers make the sun seem more reddish to the natural eye.

Stars Twinkle

Because of various atmospheric refractions from the starlight the stars twinkle. Stars are very far away from us so they seem to be sources of light. The phenomena of atmospheric fractions make these sources of light seem to be varying and therefore the position of the star also seems to fluctuate and so does the amount of light that enters the eye. This is why the stars sometimes appear to be fainter or brighter.

Planets Do Not Twinkle

Planets are seen as an extended source and are much closer to the earth. Therefore plants may be considered sources of light a lot of the time. The light coming from individual point-sized sources flickers but the total amount of light entering our point size flown all point-sized sources seems to average out the constant. Therefore planets are always brighter but don't twinkle as much.

Why Does the Sky Appear Dark Instead of Blue to Astronauts?

The sky appears blue because of the scattering of light of a shorter wavelength by particles in the atmosphere to the earth. If the earth had no atmosphere, then the sky would appear blue at all cause there would be no scattering of light. When the astronaut is in space he doesn't see any atmosphere so it appears dark to them.

CBSE Class 10 Science Chapter 11 Important Questions

Why does the sky appear dark instead of blue to the astronaut?

Explain why planets do not twinkle

Why do stars twinkle

Write two causes of hypermetropia. Show the diagram to correct hypermetropia.

What is presbyopia? State the causes of this defect. How is the presbyopia of a person corrected?

What is a scattering of the light?

What is the range of vision?

What is the basic cause of atmospheric refraction?

Can visible light be scattered through atoms and molecules in the atmosphere?

Why does the sky look blue?

What is the spectrum?

Why do different colours deviate through different angles when passing through a prism?

What is the function of the optic nerve in the human eye?

Why are we not able to see things clearly when coming out of a dark room?

Why do we observe the wavering or flickering of objects when we are near a fire during the daytime?

Why does the sun appear reddish in the morning?

What happens to the image distance in the eye when we increase the distance of an object from the eye?

Why is a normal eye not able to see things clearly when the objects are placed closer than 25 cm?

Benefits of Ch 11 Science Class 10 Important Questions

Pupils must appreciate the significance of this topic and what it holds for sophisticated schoolchildren. Students will be able to get the most on their examinations if they use the relevant questions and follow a strict practice regimen. These examinations might be challenging without good supervision, but by utilising Vedantu, students will be prepared to study in a more organised manner.

The following are the advantages of Chapter 11 Science Class 10 Important Questions:

Students can use Vedantu to use their time wisely, it helps boost their confidence after consistent practice and students can plan their preparation accordingly.

It provides students with a structure with which they will study for his or her upcoming examinations.

This is a fundamental chapter for college kids and plays an important role in upcoming grades.

The concepts taught in this chapter will help set the basic knowledge on the human eye for students.

Students studying this subject will also find the notes to be quite handy as well.

Students don’t need to worry about the relevance of those questions as they're all cross-checked and updated consistently with the newest CBSE guidelines and rules. therefore the information in this article is genuine and reliable.

Conclusion

This chapter demonstrated the numerous functions of the human eye. The most essential notion in this chapter is how light affects how we view different objects and how the eye processes it. The human eye is extremely complex, and this chapter has demonstrated how it interprets numerous objects. This chapter on the human eye has also provided us with insight into how the human eye perceives different things and how light plays an important role.

This chapter addresses numerous questions that students have about light, such as light dispersion, star twinkling, why planets don't sparkle, and many others. This chapter also explains how concave and convex lenses function in the human eye. Students may utilise this article to make better use of their time; it will enhance students' confidence with constant practise, and students will be able to schedule their preparation properly. Students might work harder to achieve their goals and achieve higher grades. These crucial questions ensure that students are aware of the subject's numerous subjects and are learning.

Important Related Links for CBSE Class 10 Science

FAQs on Human Eye and Colourful World Class 10 Important Questions with Answers | CBSE Science Chapter 11 (2024-25)

1. What is Presbyopia and what causes it? How is it corrected?

Presbyopia is a defect of the human eye. Individuals with this defect are unable to view objects far off or even those close by clearly. Presbyopia is caused due to the following reasons.

Ageing causes a decrease in the eye’s power of accommodation

Weakening of the ciliary muscles of the eye.

Presbyopia is commonly corrected by the use of a bifocal lens where the upper half is concave while the lower half is convex. Surgery is also used these days for the correction of presbyopia.

2. What causes the twinkling of stars?

The twinkling of stars is caused by the atmospheric refraction of starlight. Stars being very far away, behave almost as point sources of light. On the account of atmospheric reaction, the path of the rays of light coming from the star goes on varying slightly, causing the apparent position of the star to fluctuate and the amount of light entering the eye flickers. So, at times the stars appear brighter while at other times they appear fainter. The stars thus, twinkle.

3. Why do Astronauts see the sky as dark instead of blue?

The blue colour of the sky that we see is caused by the scattering of light shorter in wavelength by the particles present in the atmosphere of the earth. In the absence of atmosphere on earth, there would have been no particles to cause scattering of light and the sky would have appeared dark inc colour. The astronauts in space have gone above the atmosphere of the earth and there is no scattering of light. The sky thus appears dark to them.

4. Is it beneficial to refer to Class 10 Science Chapter 11 Important Questions by Vedantu?

Yes, it is absolutely beneficial to refer to the Science Class 10 Chapter 11 Important Questions by Vedantu. The important questions provided here have been carefully scripted by the subject experts and include questions that have a high probability of being asked in the examination. Additionally, Class 10 Science Chapter 11 questions have been categorised according to the marks they carry which allow students to improve their style of answering as well. Improve your scores by practising from Science Chapter 11 Important Questions by Vedantu.

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CBSE Class 10 Science MCQ Chapter 11 The Human Eye And The Colourful World

CBSE Class 10 Science MCQs Chapter 11 The Human Eye and the Colourful World

The human eye and the colourful world class 10 mcqs.

CBSE Class 10 Science MCQs Chapter 11 The Human Eye and the Colourful World help students learn important concepts efficiently. Students preparing for Class 10 Science Board exams must not forget to practise the multiple-choice questions. Here, we have provided the MCQs of Chapter 11, The Human Eye and the Colourful World, so that students can memorise the fundamental concepts with ease. The Human Eye and the Colourful World MCQs will help students to fetch marks from this chapter easily. These multiple choice questions on Human Eye and the Colourful World are based on the latest CBSE Class 10 Science Syllabus and are designed by our subject experts.

Download CBSE Class 10 Science MCQs Chapter 11 The Human Eye and the Colourful World with Answers PDF

Students must cover the following concepts from the NCERT Class 10 Science Textbook before solving these multiple-choice questions to answer them correctly.

The Human Eye
Power of Accommodation
Defects of vision and their correction
Refraction of Light through a Prism
Atmospheric Refraction
Scattering of Light

Students can also access the CBSE Class 10 Science MCQs for other chapters to prepare for their board exams.

CBSE Class 10 Science MCQs Chapter 11 The Human Eye and the Colourful World with Answers

Q1) A person went for a medical check-up and found that the curvature of his eye lens was increasing. Which defect is he likely to suffer from?

(b) Cataract

(d) Hypermetropia

Correct Answer: Option (a)

Q2) A person gets out in the sunlight from a dark room. How does his pupil regulate and control the light entering the eye?

(a) The size of the pupil will decrease, and less light will enter the eye

(b) The size of the pupil will decrease, and more light will enter the eye

(d) The size of the pupil will remain the same, but less light will enter the eye

Q3) When light rays enter the eye, most of the refraction occurs at the

(a) Crystalline lens

(b) The outer surface of the cornea

Correct Answer: Option (b)

Q4) In which part of the human eye is the image of an object formed?

Correct Answer: Option (c)

Q5) The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because, among all other colours, the red light

(a) is scattered the most by smoke or fog

(b) is scattered the least by smoke or fog

(d) moves fastest in the air

Q6) Which of the following phenomena of light are involved in the formation of a rainbow?

(a) Reflection, refraction and dispersion

(b) Refraction, dispersion and total internal reflection

(d) Dispersion, scattering and total internal reflection

Q7) A person sees an object closer to his eyes. What changes will take place in his eyes?

(a) the pupil size will expand

(b) the ciliary muscles will contract

(d) the light entering the eye will be more

Q8) The splitting of white light into different colours on passing through a prism is called

(a) reflection

(b) refraction

(d) deviation

Q9) The image shows a light ray incident on a glass prism.

CBSE Class 10 Science MCQ Chapter 11 The Human Eye and the Colourful World-1

The various angles are labelled in the image. Which angle shows the angle of incidence and angle of refraction, respectively?

(a) A and D

(b) B and E

(d) D and F

Q10) The deflection of light by minute particles and molecules of the atmosphere in all directions is called ____________ of light.

(a) dispersion

(b) scattering

(d) Tyndall effect

Q11) Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

(a) Dispersion of light

(b) Scattering of light

(d) Reflection of light from the earth

Q12) Why do stars appear to twinkle at night?

(a) Because the light of stars travels in a different medium

(b) Because the distance of a star varies when the earth rotates

(d) Because the atmosphere reflects the light at different angles

Q13) When white light enters a prism, it gets split into its constituent colours. This is due to

(a) different refractive index for the different wavelengths of each colour

(b) each colour having the same velocity in the prism

(d) Scattering of light

Q14) When white light enters a glass prism from the air, the angle of deviation is least for

(a) blue light

(b) yellow light

(d) red light

Correct Answer: Option (d)

Q15) Which option justifies that the Sun appears red at sunrise and sunset?

(a) Red scatters highest by the atmosphere

(b) The distance between the sun and earth reduces

(d) The white light disperses into seven colours, only red enters the atmosphere

Q16) At noon, the sun appears white as

(a) Light is least scattered

(b) All the colours of white light are scattered away

(d) Red colour is scattered the most

Q17) Twinkling of stars is due to atmospheric

(a) dispersion of light by water droplets

(b) refraction of light by different layers of varying refractive indices

(d) internal reflection of light by clouds

Q18) The image shows the dispersion of the white light in the prism.

CBSE Class 10 Science MCQ Chapter 11 The Human Eye and the Colourful World-2

What will be the colours of the X, Y and Z?

(a) X: red; Y: green; Z: violet

(b) X: violet; Y: green; Z: red

(d) X: red; Y: violet; Z: green

Q19) Which image shows the deviation of light in a prism?

CBSE Class 10 Science MCQ Chapter 11 The Human Eye and the Colourful World-3

Q20) The image shows the ray diagram of a defective eye.

CBSE Class 10 Science MCQ Chapter 11 The Human Eye and the Colourful World-4

Frequently Asked Questions on The Human Eye and the Colourful World

The tyndall effect is the scattering of light by ……………….

Colloidal particles.

Which colour is refracted the most when white light is dispersed from a prism?

Why does the sun appear yellowish-white at noon.

The sun appears yellowish-white at noon because sunlight has to travel a relatively shorter atmospheric distance.

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Class 10th Science - Human Eye and the Colourful World Case Study Questions and Answers 2022 - 2023

QB365 provides a detailed and simple solution for every Possible Case Study Questions in Class 10th Science Subject - Human Eye and the Colourful World, CBSE. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.

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Human eye and the colourful world case study questions with answer key.

10th Standard CBSE

Final Semester - June 2015

(ii) The angle between the incident ray and the emergent ray is called

(iii) When a ray is refracted through a prism, then

(iv) The angle of deviation depends on

(v) The rectangular surfaces of a prism are known as

(ii) Which property of light is used by prism to form a spectrum?

(iii) Which of the following dispersion is correct?

(iv) When a red light passes through a prism, it (a) will not split (b) will split into seven colours (c) will split into white colour (d) will split into many different colours. (v) The spectrum produced by the white light by a prism is called

Light of all the colour travel at the same speed in vacuum for all wavelengths. But in any transparent medium (glass or water), the light of different colours travel with different speeds for different wavelength that means that the refractive index of a particular medium is different for different wavelength. As there is a difference in their speeds, the light of different colour bend through different angles. The speed of violet colour is maximum and the speed of red colour is minimum in glass so, the red light deviates least and violet colour deviates most. Hence, higher the wavelength of a colour of light, smaller the refractive index and less is the bending of light. $\begin{equation} \lambda \end{equation}$ r > $\begin{equation} \lambda \end{equation}$ v and r n < v n , $\begin{equation} v=\frac{c}{\lambda} . \end{equation}$ (i) Which of the following statements is correct regarding the propagation of light of different colours of white light in air? (a) Red light moves fastest. (b) Blue light moves faster than green light. (c) All the colours of the white light move with the same speed. (d) Yellow light moves with the mean speed as that of the red and the violet light. (ii) Which of the following is the correct order of wavelength?

(iii) Which of the following is the correct order of speed of light in glass?

(iv) Which colour which has maximum frequency

(v) Which of the following is the correct order of angle of deviation?

The spreading of light by the air molecules is called scattering oflight. The light having least wavelength scatters more. The sun appears red at sunrise and sunset, appearance of blue sky it is due to the scattering of light. The colour of the scattered light depends on the size of particles. The smaller the molecules in the atmosphere scatter smaller wavelengths of light. The amount of scattering of light depends on the wavelength of light. When light from sun enters the earth's atmosphere, it gets scattered by the dust particles and air molecules present in the atmosphere. The path of sunlight entering in the dark room through a fine hole is seen because of scattering of the sun light by the dust particles present in its path inside the room. (i) To an astronaut in a spaceship, the colour of earth appears

(ii) At the time of sunrise and sunset, the light from sun has to travel. (a) longest distance of atmosphere (b) shortest distance of atmosphere (c) both (a) and (b) (d) can't say (iii) The colour of sky appears blue, it is due to the (a) refraction oflight through the atmosphere (b) dispersion of light by air molecules (c) scattering of light by air molecules (d) all of these. (iv) At the time of sunrise and sunset (a) Blue colour scattered and red colour reaches our eye (b) Red colour scattered and blue colour reaches our eye (c) Green and blue scattered and orange reaches our eye (d) None of these (v) The danger signs made red in colour, because (a) the red light can be seen from farthest distance (b) the scattering of red light is least (c) both (a) and (b) (d) none of these

Atmospheric refraction is the phenomenon of bending of light on passing through earth's atmosphere. As we move above the surface of earth, density of air goes on decreasing. Local conditions like temperature etc. also affect the optical density of earth's atmosphere. On account of atmospheric refraction, stars seen appear higher than they actual are; advanced sunrise; delayed sunset, oval appearance of the sun at sunrise and sunset; stars twinkle, planets do not. (i) Due to atmospheric refraction, apparent length of the day

(ii) Apparent position of the star appears raised due to

(iii) The sun appears oval shaped or flattened due to

(iv) Twinkling of stars and non-twinkling of planets is accounted for by

(v) In absence of atmosphere, the colour of sky appears

(ii) The colour of white light which suffers the maximum bending (or maximum refraction) on passing through a glass prism is :

(iii) Which of the following colour of white light is least deviated by the prism ?

(iv) The colour of white light which is deviated the maximum on passing through the glass prism is :

(v) The splitting up of white light into seven colours on passing through a glass prism is called :

(ii) Stars appear to twinkle because of :

(iii) At noon the Sun appears white as : (a) Light is least scattered (b) All the colours of the white light are scattered away (c) Blue colour is scattered the most (d) Red colour is scattered the most (iv) Which of the following phenomena of light is involved in the formation of rainbow? (a) Reflection, refraction and dispersion (b) Refraction, dispersion and total internal reflection (c) Refraction, dispersion and internal reflection (d) Dispersion, scattering and total internal reflection (v) Which of the following statements is correct regarding the propagation of light of different colours of white light in air? (a) Red light moves with the fastest speed (b) Blue light moves faster than green light (c) All the colours of the white light move with the same speed. (d) Yellow light moves with the mean speed as that of the red and the violet light

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Case Study Questions Class 10 Science
At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks. Case study 1. As we know that, the ciliary muscles are responsible for change in focal length of the eye lens.
The Human Eye and The Colourful World Case Study Questions ...
Case Study/Passage-Based Questions. Question 1: When white light is incident on one refracting surface of the prism, the light splits up into constituent colours violet, indigo, blue, green, yellow, orange and red. The process of splitting of white light into its seven constituent colours is called dispersion.
Case Study and Passage Based Questions for Class 10 Science Chapter 11
There will be a few questions based on case studies and passage based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked. Here, we have provided case based/passage based questions for Class 10 Science Chapter 11 The Human Eye and The Colourful World. Question 1:
Case Study Chapter 11 Human Eyes and Colourful World
Case Study Questions Chapter 11 Human Eyes and Colourful World. Case/Passage - 1. Human eye is spherical in shape and has diameter of about 2.5 cm. Sclerotic is a tough, opaque and white substance forming the outermost coating of the eyeball. The front portion. is sharply curved and covered by a transparent protective membrane called the ...
CBSE 10th Science Human Eye and the Colourful World Case Study
CBSE 10th Standard Science Subject Human Eye and the Colourful World Case Study Questions With Solution 2021 Answer Keys. (i) (a): The angle between the two refracting surfaces of a prism is called angle of prism. (ii) (b): The angle between the incident ray and the emergent ray is called angle of deviation.
Human Eye and Colourful World Case Study Based Questions Class 10
Students who are studying in CBSE class 10 board, need to get the knowledge about the Human Eye and Colourful World Case Study Based Questions. Case based questions are generally based on the seen passages from the chapter Human Eye and Colourful World. Through solving the case based questions, students can understand each and every concept.
Class 10 Science Chapter 10 Case Based Questions
Document Description: Case Based Questions: The Human Eye and the Colourful World for Class 10 2024 is part of Additional Practice for Class 10 preparation. The notes and questions for Case Based Questions: The Human Eye and the Colourful World have been prepared according to the Class 10 exam syllabus. Information about Case Based Questions: The Human Eye and the Colourful World covers topics ...
Class 10 Science: Case Study Chapter 11 The Human Eye and The Colourful
Here we are providing you with Class 10 Science Chapter 11 The Human Eye and The Colourful World Case Study Questions, by practicing these Case Study and Passage Based Questions will help you in your Class 10th Board Exam.
The Human Eye and The Colourful World
The Human Eye and The Colourful World | Case-Based Questions | CBSE Class 10 Physics | Science Chapter 10 NCERT Solutions | Abhishek Sir | Vedantu Class 9 an...
Case Study Based Questions[ Most important MCQs ] L-4
Case Study Based Questions | Human Eye and Colorful World Class 10 Physics Chapter 11 | MCQ's for Class 10 Science | CBSE Class 10 Physics Chapter 11 | NCERT...
The Human Eye and The Colourful World Case Study Questions (CSQ's)
Please Login or Sign up to continue! TopperLearning provides a complete collection of case studies for CBSE Class 10 Physics The Human Eye and The Colourful World chapter. Improve your understanding of biological concepts and develop problem-solving skills with expert advice.
Case Study MCQ Questions Chapter 11 Human Eyes and Colourful World
Chapter 11 Human Eyes and Colourful World Class 10 Science Case Study MCQ Questions. The human eye is spherical in shape and has diameter of about 2.5 cm. Sclerotic is a tough, opaque and white substance forming the outermost coating of the eyeball. The front portion is sharply curved and covered by a transparent protective membrane called the ...
Case Based Questions Test: The Human Eye & the Colourful World
The Case Based Questions Test: The Human Eye & the Colourful World questions and answers have been prepared according to the Class 10 exam syllabus.The Case Based Questions Test: The Human Eye & the Colourful World MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online ...
Human eye class 10: CBSE previous question paper problems (2021
1. Similar problems (4) Q10.1. Explain the formation of a rainbow in the sky with the help of a diagram. 3 2011. Q10.2. Draw a diagram to show the formation of a rainbow and mark the points where ( i ) dispersion and ( ii ) internal reflection occurs. 3 2012.
The human eye and the colourful world
Unit test. Level up on all the skills in this unit and collect up to 700 Mastery points! What's inside our eyes? How do they work? Why do some people wear spectacles? Why do the stars twinkle? In this chapter, we will use the rules of refraction to explore the working of our eyes and their defects. We will learn how dispersion creates rainbows ...
CBSE Class 10 Physics Human Eye Important Questions and Answers for 2023
CBSE Class 10 Important Questions on Science Chapter- Human Eye and Colourful World MULTIPLE CHOICE QUESTIONS. 1. Colour of sky appears blue, due to the ... CASE STUDY BASED QUESTIONS.
Human eye: CBSE board practice (video)
let's summarize this entire chapter on the right side you can see the different subtopics and the times at which they begin if you want to jump to a specific subtopic all right let's start with the mind map so human island colorful world consists of two topics the human eye and the colorful world in human eye we first study the structure of the eye this is where we learn about the different ...
Human Eye and Colourful World Class 10 Important Questions ...
Vedantu's important questions on CBSE Class 10 Science Chapter 11 - Human Eye and Colourful World will help students achieve their dream scores in their Class 10 Science exams b y preparing them with the best quality answers to all the major questions that can be asked in the test.. This chapter focuses on the human eye and its various functions for humans and how it helps us in our day-to ...
Human Eye and Colourful World Class 10 Important Questions with Answers
1 Class 10 Science Chapter 11 Important Questions with Answers Human Eye and Colourful World. ... Class 10 Chemistry Chapter 11 Important Questions with Answers Human Eye and Colourful World. ... If, in this case, the numerical value of the focal length of the corrective lens is 5 m, find the power of the lens as per the new Cartesian sign ...
10th Science Human Eye and the Colourful World Case Study Questions and
Human Eye and the Colourful World Case Study Questions With Answer Key Answer Keys. Case Study. (i) (a): The angle between the two refracting surfaces of a prism is called angle of prism. (ii) (b): The angle between the incident ray and the emergent ray is called angle of deviation. (iii) (d): As the ray of light enters from rarer medium (air ...
The human eye and the colourful world: Unit test
Unit test. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
CBSE Class 10 Science MCQ Chapter 11 The Human Eye and the Colourful World
Download CBSE Class 10 Science MCQs Chapter 11 The Human Eye and the Colourful World with Answers PDF. Students must cover the following concepts from the NCERT Class 10 Science Textbook before solving these multiple-choice questions to answer them correctly. The Human Eye. Power of Accommodation.
10th Science Human Eye and the Colourful World Case Study Questions and
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A narrow beam of white light is passing through a glass prism as shown in the diagram. Study the diagram and answer the questions. In nature, this phenomenon is observed in

A narrow beam of white light is passing through a glass prism as shown in the diagram. Study the diagram and answer the questions. Which of the following statement is correct about constituents of white light based on above observations?

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Ciliary Muscles

Power of Accommodation of the Eye

Sun Appear Reddish in the Morning

Stars Twinkle

Planets Do Not Twinkle

Why Does the Sky Appear Dark Instead of Blue to Astronauts?

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