case study based questions on light class 8

Class 8 Science Case Study Question

Case study question class 8 science (cbse / ncert board).

Class 8 Science Case Study Question and Answer: CBSE / NCERT Board Class 8 Science Case Study Question prepared by expert Science Teacher. Students can learn Case Based Question / Paragraph Type Question for NCERT Class 8 Science.

There are total 18 chapter Crop Production and Management, Microorganisms: Friend and Foe

, Synthetic Fibres and Plastics, Materials: Metals and Non-Metals, Coal and Petroleum, Combustion and Flame, Conservation of Plants and Animals, Cell – Structure and Functions, Reproduction in Animals, Reaching the Age of Adolescence, Force and Pressure, Friction, Sound, Chemical Effects of Electric Current, Some Natural Phenomena, Light, Stars and the Solar System, Pollution of Air and Water

For any problem during learning any Case or any doubts please comment us. We are always ready to help You.

CBSE Class 8 Science Case Study Question

Chapter 1 Crop Production and Management Case Study Question
Chapter 2 Microorganisms: Friend and Foe Case Study Question
Chapter 3 Synthetic Fibres and Plastics Case Study Question
Chapter 4 Materials: Metals and Non-Metals Case Study Question
Chapter 5 Coal and Petroleum Case Study Question
Chapter 6 Combustion and Flame Case Study Question
Chapter 7 Conservation of Plants and Animals Case Study Question
Chapter 8 Cell – Structure and Functions Case Study Question
Chapter 9 Reproduction in Animals Case Study Question
Chapter 10 Reaching the Age of Adolescence Case Study Question
Chapter 11 Force and Pressure Case Study Question
Chapter 12 Friction Case Study Question
Chapter 13 Sound Case Study Question
Chapter 14 Chemical Effects of Electric Current Case Study Question
Chapter 15 Some Natural Phenomena Case Study Question
Chapter 16 Light Case Study Question
Chapter 17 Stars and the Solar System Case Study Question
Chapter 18 Pollution of Air and Water Case Study Question

What is Case Study Question?

Ans. At case Study there will one paragraph and on the basis of that concept some question will made. Students have to solve that question.

How many marks will have at case based question?

Most of time 5 questions will made from each case. There will 1 or 2 marks for each question.

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Important Questions Class 8 Science Chapter 16

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case study based questions on light class 8

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Important Questions Class 8 Science Chapter 16 – Light

Chapter 16 of Class 8 Science is about Light. The chapter Light starts with the concepts and meaning of light and the laws of reflection. Students might have already heard the word reflection in the previous chapter. In this unit, students learn what reflection is and what laws are associated with it. This chapter will answer the most common questions in students’ minds, like how can a visually impaired person read. How can an owl see only at night but not during daylight? What is the braille system? And other such questions. In this chapter, you will also study the human eye and the construction of the human eye. Students will also learn fun experiments for explaining reflections, such as how to build a kaleidoscope. By completing this chapter, students will be capable of understanding many interesting concepts

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Extramarks is an online learning platform providing educational resources to lakhs of students. One of the important features of our study material is that we provide a lot of questions and solutions. Students can master any subject or topic with the practice of relevant questions. Students can refer to our question bank of Important Questions Class 8 Science Chapter 16 to gain a better understanding of the concepts covered in Chapter ‘Light’. The Important Questions: Class 8 Science Chapter 16 will boost students’ confidence and preparation for the exam. The question bank covers all varieties of questions that are helpful for the students to understand the concepts in the best way.

Our in-house experienced Science faculty members prepare our question bank Chapter 16 Class 8 Science Important Questions and all of its solutions. The questions are taken from different authentic sources such as the NCERT textbook, past year’s question papers, and NCERT exemplar books. It includes MCQ types of questions, and short and long-answer questions based on the CBSE exam pattern. Students are advised to register on the Extramarks website and access unlimited and extended study materials on the desired topics.

Get Access to CBSE Class 8 Science Important Questions 2022-23 with Chapter-Wise Solutions

You can also find CBSE Class 8 Science Chapter-by-Chapter Important Questions here:

Important Questions Class 8 Science Chapter 16 – With Solutions

Considering that our team has collated questions from different sources in one place, our question bank of Class 8 Science Chapter 16 Important Questions has proven helpful for a lot of students. Our Science expert faculty members have prepared detailed and step-by-step instruction-based answers for each of the questions covered in our question bank. Students will be able to fully revise the chapter while they are solving questions.

Below are a few questions and their solutions from our question bank of Important Questions Class 8 Science Chapter 16.

Question 1. Image formed in a plane mirror undergoes _______________.

Answer 1. lateral inversion.

The reversal of a mirror image, where the object’s right side appears on the left side behind the mirror, is known as lateral inversion.

Question 2. Name the part of the eye that gives a distinctive colour.

Answer 2. Iris is the part of our eye that gives us distinctive colour. The iris is a coloured ring that surrounds our pupils and gives our eyes their distinct colour.

Question 3. The lens that focuses light on the back of the eye, on a layer called___________.

Answer 3. Retina.

Several thousand light-sensitive cells (rods and cones) and some other nerve cells make up the retina, which receives and organises visual data. Through our optic nerve, retina sends this information to brain, allowing us to see.

Question 4. What is a blind spot?

Answer 4. There are no sensory cells at the optic nerve and the retina intersection. Hence, vision is not possible there. This is known as the blind spot.

Question 5. ____________ are sensitive to bright light in eye.

Answer 5. Cones.

In the retina, cones are a kind of photoreceptor cell. They are responsible for our colour perception. Cones are concentrated in the macula, located in the centre of our retina and help us see small details.

Question 6. Lack of which nutrient element is responsible for eye troubles?

Answer 6. The deficiency of Vitamin A causes eye troubles. Xerophthalmia is a progressive eye problem caused by a lack of vitamin A. Xerophthalmia can progress to night blindness or more serious damage to the cornea, the outer layer of the eye.

Question 7. Some persons may lose their vision because of a _________ or an __________.

Answer 7. Disease, injury.

Question 8. Who developed a system for visually impaired people and published it in 1821?

Answer 8. The Braille system was developed in the 1820s by Louis Braille and is the most commonly used resource for visually challenged people. Blind individuals read and write using the Braille system. A set of raised bumps or dots can be sensed with the help of a finger in the Braille system.

Question 9. Do you think a light ray is an idealisation? Why?

Answer 9. Yes, a ray of light is an idealisation. A narrow beam of light is made up of several rays. For simplicity, the word ray is used for a little light beam.

Question 10. Give any two uses of the periscope.

Answer 10. Tanks, submarines, and soldiers in bunkers use periscopes to see things outside.

Question 11. List the food items that contain vitamin A.

Answer 11. Vitamin A is abundant in raw carrots, broccoli, green vegetables (such as spinach), and cod liver oil. Vitamin A is found in eggs, milk, curd, cheese, butter, and fruits like papaya and mango.

Question 12. State laws of reflection.

Answer 12. ‘The incidence angle is equal to the reflection angle,’ says the first law of reflection.

The incident reflected, and normal rays drawn at the point of incidence to the reflecting surface lie in the same plane, per the second law of reflection.

Question 13. Give any four examples of luminous objects.

Answer 13. The sun, fire, candle flame, and an electric lamp are luminous objects.

Question 14. Explain regular reflection with the help of a diagram.

Answer 14. A regular reflection is a reflection made from a smooth surface like a mirror. Regular reflection creates images.

Question 15. What is the function of the retina?

Answer 15. The lens directs incident light to the retina, which includes several nerve cells. The nerve cells’ sensations are then transferred to the brain through the optic nerve.

Question 16. Give an example to show that reflected light can be reflected again.

Answer 16. Stand in front of a mirror and ask a friend to hold a mirror behind you so you can see your haircut; your hair image will appear in the mirror in front of you; this is the best example of reflected light returning to the source.

Question 17. Can we see objects in the dark? Why?

Answer 17. When the incident light is reflected by the object and reaches our eyes, we can see it. However, when the object reflects no light, we cannot see it.

Question 18. How do you make a kaleidoscope?

Answer 18. Make three small rectangular mirror strips, each about 15 cm long and 4 cm wide, to make a kaleidoscope. Connect them together to make a prism. Place these mirrors in a circular cardboard tube or a tube made of thick chart paper. Assemble the tube such that it is slightly bigger than the mirror strips. Close one end of this tube with cardboard with a hole in the middle that you can see through. Put a piece of the transparent plastic sheet under the cardboard to make it more durable. Fix a round plate glass on the opposite end, touching the mirrors. Place numerous pieces of coloured glass on this glass plate (broken pieces of coloured bangles). A round glass plate is used to close this end of the tube. Make sure there’s enough space for the coloured pieces to move around. Now the kaleidoscope is ready to be used.

Question 19. Write any five ways to take care of your eyes.

Answer 19. Some common measures to take care of the eyes are as follows-

Use suitable eyewear if advised.
It is not good for the eyes to have too little or too much light. Eye strain and headaches are caused by insufficient light. The retina can be impaired by too much light, such as sunlight, a strong lamp, or a laser torch.
Do not look directly at the sun or bright light.
Do not rub your eyes. If dust particles enter your eyes, rinse them with clean water. If your condition does not improve, go to the doctor.
Always read books at a comfortable distance for your eyes. Avoid reading the book too close to your eyes or keeping it too far away when reading.

Question 20. Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

Answer 20. If a person is inside a room with no light, it is impossible to see the object inside the dark room, but the object outside the room is seen easily.

When light falls on the eyes after reflecting from the object, it becomes visible. If the room is dark, the objects in the room reflect no light. Hence, the person cannot see the objects in the room without light.

Question 21. Mention the following, whether regular or diffused reflection, which will occur when a light beam strikes. Justify your answer in each case.

(a) A Polished wooden table.

(b) Chalk powder.

(d) A Marble floor with some water spread over it.

(e) A Mirror.

(f) A Piece of paper.

Answer 21. a) A wooden table that has been polished-regular reflection.

A surface polished recently is an example of a smooth surface. A wooden table that has been polished has a smooth surface.

b) White chalk powder used in school- diffused reflection

chalk powder spread over a surface is a good example of an irregular surface. Hence, it is rough. Therefore, the diffused reflection will appear from the chalk powder.

c) Cardboard surface- diffused reflection.

The cardboard surface is a type of irregular surface.Hence, the diffused reflection will occur from a cardboard surface.

d) Marble floor – regular reflection.

A marble floor can be a good example of a stable surface. Since water makes the ceramic shiny, , the reflections are regular occurrences on this surface.

e) Mirror- regular reflection

A mirror has a very smooth surface, giving a regular reflection.

f) Piece of paper- diffused reflection

Although a piece of paper looks smooth, it has many irregularities on its surface. Due to this, it will give a diffused reflection.

Question 22. State the laws of reflection.

Answer 22. The law of reflection states that

a) The angle of incidence and angle of reflection are always equal.
b) At the point of incidence, the incident ray, reflected ray, and normal to the reflective surface all lie in the same plane.

Question 23. Describe that the incident ray, the reflected ray, and the normal at the point of incidence lie in the same plane.

Answer 23. On a table, place a plane mirror normal to the plane of the table. Make a small hole in a piece of paper and hold it perpendicular to the table. Try this experiment in a dark room. Put one more piece of paper on the table to make contact with the mirror. Draw a perpendicular line to the mirror on the piece of paper on the table. Now beam light rays with the help of a torch will pass through the small hole so that the light beam hits the normal at the lower part of the mirror. The light rays from the hole incident on the mirror will reflect the ray of light. Looking at the paper on the table, we can simply show that the incident ray, normal ray, and reflected ray at the incidence point lie in the same plane.

Question 24. What will be the angle of incidence of a ray when the reflected ray is perpendicular to the incident ray?

Answer 24. If the reflected ray lies perpendicular to the incident ray, then the angle of incidence is 45 degrees. According to the laws of reflection, the incidence angle and the angle of reflection are equal. Hence, the incidence ray and angle of reflection are 90/2=45 degrees.

Question 25. How many images of the candle will be seen if it is placed between two parallel plane mirrors separated by a distance of 40 cm?

Answer 25. When a candle is placed between two parallel plane mirrors separated by 40 cm, multiple and infinite images will be seen due to the multiple reflections between the mirrors. An unlimited number of images are formed when two mirrors are placed parallel to each other.

Question 26. The part of the eye which controls the light entering is called –

Answer 26. The answer is option (a) iris.

Explanation – Iris is a dark, muscular part behind the cornea. Its function is to regulate the entry of light.

Question 27. We can see a non-luminous object when light-

(a) completely passes through the object.

(b) gets completely absorbed by the object.

(d) is reflected from the object towards the eye.

Answer 27. The answer is option (d) is reflected from the object towards the eye.

Question 28. A light ray incident on mirror A at an angle of 25 degrees falls on mirror B after reflection. The angle of reflection for the reflected ray from mirror B would be-

(a) 25 degrees.

(b) 50 degrees.

(d) 115 degrees.

Answer 28. The answer is option (c) 65 degrees.

Explanation- The angle of reflection for the ray reflected from mirror B will be 65° because the reflected ray from mirror A forms an incident ray on mirror 6 and is then reflected by an angle of 65°.

Question 29. Which statements are correct regarding rods and cones in the human eye?

(a) Cones are sensitive to dim light.

(b) Cones are sensitive to bright light.

(d) Rods can sense colour.

Answer 29. The answer is option (b) Cones are sensitive to bright light.

Explanation- Cones are sensitive to bright light; hence, they sense colour, whereas rods are sensitive to dim light and cannot sense colour.

Question 30. Which part of the eye gives colour to our eyes?

Answer 30. Iris of the eye gives colour to the eyes.

Question 31. While waving his hand fastly in front of his eyes, Boojho observes that his fingers appear blurred. What could be the reason for it?

Answer 31. The persistence of vision is the reason for the blurred vision of Boojho; while waving his hand fastly in front of his eyes, he observes that his fingers appear blurred.

Question 32. How often is a ray of light reflected by two plane mirrors placed parallel and facing each other?

Answer 32. Two plane mirrors reflect an infinite number of times, a ray of light placed parallel and facing each other.

Question 33. The angle between the ray of incidence and the reflected ray is 60°. What is the angle of incidence?

Answer 33. The answer is 30°.

Explanation- The angle of reflection is equal to the angle of incidence.

Since, the Angle of incident ray+ Angle of reflected ray is 60°.

The angle of incidence = 30°

Question 34. What happens to the light when it gets dispersed? Give an example.

Answer 34. When the light gets dispersed, it gets split into its constituent colours. Ex: rainbow.

Question 35. The eyes of nocturnal animals have large corneas and large pupils. How does this structure help them?

Answer 35. They can see objects even in low light. A large pupil and a large cornea help lighter enter their eyes.

Question 36. What type of lens is found in our eyes? Where does it form the image of the object?

Answer 36. Our eyes have a convex lens, forming the image on the retina.

Question 37. Which part of the eye gets affected when someone suffers from a cataract? How is it treated?

Answer 37. If a person suffers from a cataract, their eye lens will become cloudy. Cataracts can be cured by replacing the opaque lens with an artificial lens.

Question 38. Explain the process which enables us to recognise motion in a cartoon film.

Answer 38.A Carton movie is a projection of a static picture. 24 pictures are shown in one second in a specific order, giving us the perception of movement.

Question 39. How is the phenomenon of light reflection used in making a kaleidoscope? What are the uses of a kaleidoscope?

Answer 39. The kaleidoscope gives several images formed by reflection from the mirrors inclined towards one another. Designers and artists use a kaleidoscope to get ideas for new patterns to design wallpapers, jewellery, and fabrics.

Question 40. What is a periscope? How many mirrors are there in a periscope?

Answer 40. A periscope is an instrument that reflects the reflected ray again. It is made of a tube attached to a set of mirrors. There are two mirrors in a periscope.

Question 41. State the various uses of a periscope.

Answer 41. Uses of periscope-

It is used to see over and around an object.
It is used to see over a wall.
Used in warfare.

Question 42. Can you see your image in a plane mirror? Write two characteristics of the image so formed.

Answer 42. Yes, we can see our image in a plane mirror. The image formed will be-

Virtual and erect.
The same size as the object

Question 43. Explain why a book lying on the table in a room can be seen from all parts of the room.

Answer 43. A book lying on the table in a room can be seen from all parts of the room because of the light reflection falling on it.

Question 44. We can see the sun because it is glowing. How can we see the moon?

Answer 44. We see the moon because the light from the sun falls on the moon and is reflected on the earth.

Question 45. Write the two types of reflection of light. What kind of reflection makes us see an object from all directions?

Answer 45. The two types of light reflection are- regular reflection of light and diffuse reflection of light.

The regular reflection of light makes us see an object from all directions.

Question 46. A wall reflects light and a mirror also reflects light. What is the difference in the way they

reflect light?

Answer 46. Reflection of light from the wall is a diffused reflection, and reflection of light from a mirror is a regular reflection.

Question 47. What are the main parts of the human eye?

Answer 47. The main parts of the human eye are-

Iris, Lens, Pupil, Cornea, Retina, Ciliary muscles, and Optic nerve.

Question 48. What is the vision range of a normal person?

Answer 48. A normal human eye’s vision range is from 25cm to infinity.

Benefits of Solving Important Questions Class 8 Science Chapter 16

Our question bank of Class 8 Science Chapter 16 Important Questions covers questions from different topics covered in the Light chapter.

Students can face difficulty understanding complex topics in Science. One way to resolve this is to practise Important Questions Class 8 Science Chapter 16. The question bank covers all the important topics, and these questions are created from an exam point of view and are most likely to be asked in the exam. Practising Important Questions Class 8 Science Chapter 16 gives students a competitive edge.

Here are some benefits of solving questions from our question bank of Important Questions Class 8 Science Chapter 16.

The comprehensive question guide puts together important questions from different sources. So it’s easy for students to refer only to our question bank instead of referring to multiple sources and wasting time in searching for them. The answers to each question are prepared by experienced science teachers. They provide step-by-step answers with deep conceptual explanations which helps students prepare for exams in a balanced manner.
The series of Important Questions Class 8 Science Chapter 16 consists of objective types, short answers, and long answers. These questions adhere to the latest CBSE syllabus and are based on the exam format as prescribed by NCERT. So, students can confidently rely on our question patterns and solutions for their exam preparation.
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Q.1 Answer the following questions:

What primarily distinguishes unicellular organisms from multicellular organisms?
State the function of pseudopodia in Amoeba .
Give an example of a single cell in humans which can change its shape.

Marks: 3 Ans

Cell number primarily distinguishes unicellular organisms from multicellular organisms. Unicellular organisms are made up of a single cell, while multicellular organisms are made up of multiple cells.
Pseudopodia are the projections that protrude out of the body of Amoeba and help in movement and capturing of food.
White blood cells in humans are single-celled and can change their shape.

Q.2 What is the need of staining a section of tissue, before observing it under the microscope? Name a stain.

Marks: 2 Ans

Staining with coloured dyes makes the cellular parts clearly visible. The dyes react with cellular components to give colour to the components. Methylene blue is a blue dye that is often used to stain onion peel cells.

Q.3 Read the following functions of a certain part of cells. i. Protection against abiotic factors ii. Providing shape and rigidity to the cells iii. Selective diffusion of the materials across it iv. Site of photosynthesis Which of the following function(s) are carried out by the cell wall?

A. i and ii

B. ii and iii

C. iii and iv

D. i and iv

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Cbse class 8 science important questions, chapter 1 - crop production and management.

Chapter 2 - Microorganisms : Friend and Foe

Chapter 3 - synthetic fibres and plastics, chapter 4 - materials : metals and non-metals, chapter 5 - coal and petroleum, chapter 6 - combustion and flame, chapter 7 - conservation of plants and animals, chapter 8 - cell - structure and functions, chapter 9 - reproduction in animals, chapter 10 - reaching the age of adolescence, chapter 11 - force and pressure, chapter 12 - friction, chapter 13 - sound, chapter 14 - chemical effects of electric current, chapter 15 - some natural phenomena, chapter 17 - stars and the solar system, chapter 18 - pollution of air and water, faqs (frequently asked questions), 1. where can students easily get important questions class 8 science chapter 16.

To make it simpler for students to learn, revise, and prepare for their examinations, Extramarks provides a list of Important Questions Class 8 Science Chapter 16. With this comprehensive series of questions prepared by experts, topics from every nook and corner of the chapters are covered, thus ensuring that the students achieve better grades in their examinations. You can rely completely upon it as you get authentic and correct solutions to the Science Class 8 Chapter 16 Important Questions.

2. Is the series of Important Questions Class 8 Science Chapter 16 enough to score good marks?

The solutions we provide here at Extramarks are concise and written from an examination point of view. The answers to the exercise questions are clearly explained with examples. They are completely accurate. These solutions will help students prepare for their exams as we follow the guidelines provided by the NCERT book and the CBSE Science syllabus. These solutions will help students develop a conceptual foundation that explains all key concepts in an easy-to-get language. This exercise will cover all the topics and subtopics that your Class 8 Science exams could be expected to cover.

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Cbse, ncert and icse solution online, class 8 science case study question, case study question class 8 science (cbse / ncert board).

There are total 18 chapter Crop Production and Management, Microorganisms: Friend and Foe

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CBSE Class 8 Science Case Study Question

Chapter 1 Crop Production and Management Case Study Question
Chapter 2 Microorganisms: Friend and Foe Case Study Question
Chapter 3 Synthetic Fibres and Plastics Case Study Question
Chapter 4 Materials: Metals and Non-Metals Case Study Question
Chapter 5 Coal and Petroleum Case Study Question
Chapter 6 Combustion and Flame Case Study Question
Chapter 7 Conservation of Plants and Animals Case Study Question
Chapter 8 Cell – Structure and Functions Case Study Question
Chapter 9 Reproduction in Animals Case Study Question
Chapter 10 Reaching the Age of Adolescence Case Study Question
Chapter 11 Force and Pressure Case Study Question
Chapter 12 Friction Case Study Question
Chapter 13 Sound Case Study Question
Chapter 14 Chemical Effects of Electric Current Case Study Question
Chapter 15 Some Natural Phenomena Case Study Question
Chapter 16 Light Case Study Question
Chapter 17 Stars and the Solar System Case Study Question
Chapter 18 Pollution of Air and Water Case Study Question

What is Case Study Question?

Ans. At case Study there will one paragraph and on the basis of that concept some question will made. Students have to solve that question.

How many marks will have at case based question?

Most of time 5 questions will made from each case. There will 1 or 2 marks for each question.

Important links:

Class 8 - NCERT Science Solutions

Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

No, we cannot see objects in a dark room because there is no light to illuminate the objects in the room. When light falls on the eyes after reflecting from the object, it becomes visible. If the light is available outside the room, then the objects present would reflect it and hence we would be able to see objects.

Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

Diffused reflection is not due to the failure of the laws of reflection. It is caused by the irregularities in the reflecting surface, like that of a cardboard.

Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.

(a) Polished wooden table

(b) Chalk powder

(d) Marble floor with water spread over it

(f) Piece of paper

(a) Polished wooden table — Regular reflection Reason — The polished wooden table has a smooth surface, hence, the reflections are regular.

(b) Chalk powder — Diffused reflection Reason — Chalk powder spread on a surface will form an irregular surface, hence, the reflections are diffused.

(c) Cardboard surface — Diffused reflection Reason — The surface of the cardboard is irregular, hence, the reflections are diffused.

(d) Marble floor with water spread over it — Regular reflection Reason — Marble floor with water spread over it is a smooth surface, hence, the reflections are regular.

(e) Mirror — Regular reflection Reason — A mirror has a very smooth surface, hence, the reflections are regular.

(f) Piece of paper — Diffused reflection Reason — Piece of paper has many irregularities, hence, the reflections are diffused.

State the laws of reflection.

Two laws of reflection are :

(i) The angle of incidence is equal to the angle of reflection.

(ii) Incident ray, reflected ray and the normal drawn at the point of incidence to the reflecting surface, lie in the same plane.

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

Take a sheet of stiff paper or a chart paper. Let the sheet project a little beyond the edge of the table. Cut the projecting portion of the sheet in the middle. Look at the reflected ray. Make sure that the reflected ray extends to the projected portion of the paper. Bend that part of the projected portion on which the reflected ray falls.

When the whole sheet of paper is spread on the table, it represents one plane. The incident ray, the normal at the point of incidence and the reflected ray are all in this plane.

When we bend the paper we create a plane different from the plane in which the incident ray and the normal lie. Then we do not see the reflected ray.

Hence, the above activity indicates that the incident ray, the normal at the point of incidence and the reflected ray all lie in the same plane.

Fill in the blanks in the following.

(a) A person 1 m in front of a plane mirror seems to be ............... m away from his image.

(b) If you touch your ............... ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with ...............

(d) Night birds have ............... cones than rods in their eyes.

(a) A person 1 m in front of a plane mirror seems to be 2 m away from his image.

Reason — When a person stands in front of a plane mirror, their image appears to be as far behind the mirror as the person is in front of it. So, when the person is 1 m away from the mirror. His image will be formed at 1 m from the mirror on the other side, hence, his image will be 1 + 1 = 2 m from the person himself.

(b) If you touch your left ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your left hand.

Reason — The image formed by a mirror is laterally inverted hence, when we touch our left ear with our right hand in front of a plane mirror, it will be seen in the mirror that our right ear is touched with our left hand.

Reason — In dim light conditions, there's less available light for vision. To allow more light to enter the eye and improve visibility in low-light environments, the iris dilates the pupil. When the pupil dilates, it enlarges in size, allowing more light to pass through the eye and reach the retina at the back of the eye.

(d) Night birds have fewer cones than rods in their eyes.

Reason — Having fewer cones and more rods allows night birds to have better night vision. Rods are more sensitive to low levels of light, making them ideal for detecting prey and navigating in the dark. Additionally, having fewer cones means that night birds likely have reduced color vision or even monochromatic vision, which is less important for hunting in low-light conditions.

The angle of incidence is equal to the angle of reflection.

Under special conditions

Reason — According to the laws of reflection :

Image formed by a plane mirror is

virtual, behind the mirror and enlarged.

virtual, behind the mirror and of the same size as the object.

real at the surface of the mirror and enlarged.
real, behind the mirror and of the same size as the object.

Reason — Image formed by a plane mirror is virtual, behind the mirror and of the same size as the object.

Describe the construction of a kaleidoscope.

To make a kaleidoscope, we will take three rectangular mirror strips each about 15 cm long and 4 cm wide. We will join them together to form a prism as shown in the figure below:

After that, we will fix the arrangement of mirrors in a circular cardboard tube or tube of a thick chart paper. It should be slightly longer than the mirror strips. Close one end of the tube by a cardboard disc having a hole in the centre, through which we can see.

In order to make the disc durable, we will paste a piece of transparent plastic sheet under the cardboard disc. At the other end, touching the mirrors, we will fix a circular plane glass plate.

After that, we will place on this glass plate several small pieces of coloured glass (broken pieces of coloured bangles). Close this end of the tube by a ground glass plate. Allow enough space for the colour pieces to move around.

Our kaleidoscope is ready.

Question 10

Draw a labelled sketch of the human eye.

Labelled sketch of the human eye is shown below:

Question 11

Gurmit wanted to perform Activity 13.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher's advice?

Intensity of laser light is very high. It can cause damage to the retina and lead to blindness. Hence, Gurmit's teacher advised her not to use a laser light for the activity as she was concerned about the risk of accidental exposure to the laser beam, which could potentially cause damage to Gurmit's eyes or the eyes of others nearby.

Question 12

Explain how you can take care of your eyes.

In order to take care of our eyes we should do the following:

We should always read at the normal distance for vision. We should not bring the book too close to our eyes or keep it too far.
We should not look at the Sun or a powerful light directly.
Too little or too much light is bad for eyes. Insufficient light causes eyestrain and headaches. Too much light, like that of the Sun, a powerful lamp or a laser torch can injure the retina.
We should never rub our eyes. If particles of dust go into our eyes, we should wash our eyes with clean water or visit the doctor if need be.
If advised, we should use suitable spectacles.

Question 13

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

∠i + ∠r = 90° where

∠i = angle of incident.

∠r = angle of reflection

According to the law of reflection,

Substituting the above law in the given condition we get,

∠i = 90 2 \dfrac{90}{2} 2 90 = 45°

Therefore, angle of incidence = 45°.

Question 14

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

When a candle is placed between two parallel plane mirrors, infinite images are formed due to repeated reflections between the mirrors.

Question 15

Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig. 13.19. Draw the reflected ray from the second mirror.

Let MM' and M'M'' be the two plane mirrors at right angles.

The reflected ray from the second mirror is shown in the figure below:

Given that the ray is incident on mirror MM' at 30°,

∴ ∠AOX = 30°

∴ ∠XOO' = ∠AOX = 30°

As OX ⊥ MM' and O'X ⊥ M'M''

∴ ∠OXO' = 90°

In ΔOXO', by angle sum property.

∠XOO' + ∠OXO' + ∠XO'O = 180°

⇒ 30° + 90° + ∠XO'O = 180°

⇒ ∠XO'O = 180° - 90° - 30°

⇒ ∠XO'O = 60°

∴ Angle of incidence of the ray on M'M'' = 60°

∴ Angle of reflection of the ray from M'M'' = 60° [∵ ∠i = ∠r]

Question 16

Boojho stands at A just on the side of a plane mirror, as shown in Fig. 13.20. Can he see himself in the mirror? Also, can he see the image of objects situated at P, Q and R?

Boojho cannot see himself in the mirror because light rays originating from him do not reach his eyes after reflection.

He can see the image of objects situated at P and Q because the light rays coming from P and Q get reflected by the mirror and reach his eyes.

Boojho can't see the image of object situated at R because the light rays from object R do not reach his eyes after reflection.

Question 17

(a) Find out the position of the image of an object situated at A in the plane mirror (Fig. 13.21).

(b) Can Paheli at B see this image?

(d) When Paheli moves from B to C, where does the image of A move?

(a) Image of the object placed at A is formed behind the mirror and distance of the image from the mirror is equal to the distance of A from the mirror.

(b) Yes, Paheli at B can see this image.

(d) Image of the object at A will not move, hence, it will remain in the same position when Paheli moves from B to C.

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Chapter 16 Class 8 - Light

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Check out the NCERT Solutions, Notes, Experiments, Activities and some Extra Questions for Chapter 16 Class 8 Science - Light.

Everything is provided free of cost, and is the best education material available for Light Class 8.

In this chapter, we will study -

How do we see objects?
What are visible and invisible objects?

What are Luminous and Non-Luminous Objects?

and the Difference between them

What is Incident Ray, Reflected Ray and Normal
What is Angle of Incidence and Angle of Reflection

What are Laws of Reflection

Regular and Diffused Reflection

Image formed a Plane Mirror and its characteristics

What exactly is Lateral Inversion

Multiple Reflections of Light

and its applications like Periscope

What is a Kaleidoscope ?

How can we construct a Kaleidoscope

What is Dispersion of Light

The Human Eye - and its different parts

What is the function of Iris and Pupil?

What is a blind spot ?

Other Important Points about Human Eye like Eyelids, Range of Vision, How do we see moving objects

What is Visual Impairment?

What is Braille System

How to take proper care of eyes?

In addition to this, we have also provided some Practice Problems - both 1 mark and 2+ Marks. They are in the Extra Question link given below.

Click on a link below to get started

Note : When you click on a link below, the first question will open. To open other questions, scroll down to the bottom. You will get a list with arrows. It has everything you will need

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Light Class 8 Science Extra Questions and Answers

Light Class 8 Science Chapter 16 Extra Questions with Answers are provided here. We prepared these extra questions based on the latest NCERT Class 8 Science Book. CBSE Class 8 Science Chapter 16 Light Extra Questions will help you to properly understand a particular concept of the chapter.

Class 8 Science Chapter 16 Light Extra Questions

Very short answer type question.

Question 1: Name a device which works on the reflection of reflected light.

Answer: Periscope

Question 2: Name the point inside the human eye where no vision is possible.

Answer: Blind spot

Question 3: Name an eye disease caused by the deficiency of vitamin A in the diet.

Answer: Night blindness

Question 4: What type of reflection of light takes place from a plane mirror?

Answer: Regular reflection

Question 5: Which part of the eye converges light rays to form the image?

Answer: Eye lens

Question 6: Where is the image of an object formed in human eye?

Answer: Retina

Question 7: Which part of the eye carries images to the brain?

Answer: Optic nerve carries images to the brain.

Question 8: How many mirrors are there in a periscope?

Answer: The periscope makes use of two plane mirrors.

Question 9: Name an instrument or toy which works by producing multiple reflections from three plane mirrors to form beautiful patterns.

Answer: Kaleidoscope

Question 10: How many images of a candle will be seen when two mirrors are set parallel to each other and a candle is placed between them?

Answer: Infinite number of images of the candle will be formed.

Question 11: What type of reflection of light takes place from a rough surface?

Answer: The diffuse reflection of light takes place from a rough surface.

Question 12: What type of reflection of light takes place from a smooth surface?

Answer: Regular reflection of light takes place from a smooth surface.

Question 13: Which type of reflection of light leads to the formation of images?

Answer: Images are formed by regular reflection.

Question 14: What is an ‘incident ray’?

Answer: The light ray, which strikes any surface, is called the incident ray.

Question 15: What kind of lens (convex or concave) is there in our eyes?

Answer: The human eye has convex lens.

Question 16: What are the main parts of the human eye?

Answer: Important parts of the eye are cornea, iris, pupil, lens, retina and optic nerve.

Question 17: What is angle of incidence?

Answer: The angle between the normal and incident ray is called the angle of incidence (∠i).

Question 18: What do you mean by ‘point of incidence’?

Answer: The point of incidence is the point where the incident ray strikes the mirror.

Question 19: How we see the moon?

Answer: Moon receives light from the sun and reflects it. That’s how we see the moon.

Question 20: What are the two types of reflection of light?

Answer: The two types of reflection of light are Regular reflection of light and Diffused reflection of light.

Question 21: What is a ‘ reflected ray’?

Answer: The ray that comes back from the surface after reflection is known as the reflected ray.

Question 22: What is angle of reflection?

Answer: The angle between the normal and the reflected ray is known as the angle of reflection (∠r).

Question 23: What are the uses of periscope?

Answer: Periscopes are used in submarines, tanks and also by soldiers in bunkers to see things outside.

Question 24: Write the uses of kaleidoscope.

Answer: Designers of wallpapers and fabrics and artists use kaleidoscopes to get ideas for new patterns.

Question 25: What is the most comfortable distance at which one can read with a normal eye?

Answer: The most comfortable distance at which one can read with a normal eye is about 25 cm.

Short Answer Type Questions

Question 1: What are luminous objects? Give some examples.

Answer: The objects which emit their own light are known as luminous objects. Example: sun, fire, flame of a candle and an electric lamp.

Question 2: What are illuminated objects? Give one example.

Answer: The objects which shine in the light of other objects are called illuminated objects. Example: moon.

Question 3: Why cannot we see a book which is placed behind a wooden screen?

Answer: Wooden screen are opaque object that does not allow light to pass through it. Thus, we are not able to see through it.

Question 4: What is blind spot in the eye?

Answer: At the junction of the optic nerve and the retina, there are no sensory cells, so no vision is possible at that spot. This is called the blind spot.

Question 5: What type of image is formed by a plane mirror?

Answer: The image formed by a plane mirror is always virtual, upright, and of the same shape and size as the object it is reflecting.

Question 6: What is lateral inversion?

Answer: In an image formed by a mirror the left of the object appears on the right and the right appears on the left. This is known as lateral inversion.

Question 7: What is meant by dispersion of light’? Name a natural phenomenon showing dispersion.

Answer: Splitting of light into its colours is known as dispersion of light. Rainbow is a natural phenomenon showing dispersion.

Question 8: A ray of light is incident on a plane mirror at an angle of 40°. What is the angle of reflection?

Answer: The angle of reflection will be 40 degree. This is by the law of reflection that angle of incidence is equal to the angle of reflection.

Question 9: Gurmit wanted to perform Activity 16.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teachers advise?

Answer: Laser light is harmful for the human eye because it can injure the retina. Hence, it is advisable not to look at a laser beam directly.

Question 10: Which part of the eye gives it its distinctive color?

Answer: The iris is the part of that eye which gives it its distinctive colour. When we say that a person has green eyes, we refer actually to the colour of the iris.

Question 11: What happens to the size of the pupil of our eye in bright light?

Answer: In bright light the size of the pupil of our eye becomes small to reduce the amount of light going inside the eye. The size of the pupil is controlled by the iris.

Question 12: How can you show that white light consists of seven colors?

Answer: White light consists of seven colors can be shown by passing the light through a prism. The sunlight passes through the prism and splits into a band of 7 colors.

Question 13: What makes things visible?

Answer: Eyes alone cannot see any object. It is only when light from an object enters our eyes that we see the object. The light may have been emitted by the object, or may have been reflected by it.

Question 14: What is ‘normal’ in the reflection of light from a plane mirror?

Answer: A line drawn making an angle of 90º to the line representing the mirror at the point where the incident ray strikes the mirror is known as the normal to the reflecting surface at that point.

Question 15: What is the name of transparent front part of an eye?

Answer: The eye has a roughly spherical shape. Outer coat of the eye is white. It is tough so that it can protect the interior of the eye from accidents. Its transparent front part is called cornea.

Question 16: Name some food items which are rich in vitamin A.

Answer: Raw carrots, broccoli and green vegetables (such as spinach) and cod liver oil are rich in vitamin A. Eggs, milk, curd, cheese, butter and fruits such as papaya and mango are also rich in vitamin A.

Question 17: Why too little or too much light is bad for our eyes?

Answer: Too little or too much light is bad for eyes. Insufficient light causes eyestrain and headaches. Too much light, like that of the sun, a powerful lamp or a laser torch can injure the retina.

Question 18: A book lying on a table in a room can be seen from all the parts of the room. Give reason?

Answer: A book lying on a table in a room can be seen from all the parts of the room because the light is reflected by the book and it reaches our eye at any part of the room.

Question 19: What should we do if something like a dust particle or an insect gets into our eye?

Answer: If something like a dust particle or an insect gets into our eye, we should never rub the eye instead wash the eye with clean water. If there is no improvement, we should consult a doctor immediately.

Question 20: How a hair dresser makes us see hair at the back of our head after the hair cut is complete?

Answer: Hair dresser uses the phenomena of multiple reflections to provide view of the back of our head. After our hair cut is complete, he places a mirror at our back to show us how the hair has been cut.

Question 21: State the laws of reflection.

Answer: Two laws of reflection are:

(i) The angle of incidence is equal to the angle of reflection.

(ii) Incident ray, reflected ray and the normal drawn at the point of incidence to the reflecting surface, lie in the same plane.

Question 22: How do we see a moving picture or a movie?

Answer: movies that we see are actually a number of separate pictures in proper sequence. They are made to move across the eye usually at the rate of 24 pictures per second (faster than 16 per second). So, we see a moving picture.

Question 23: What are rods and cones in the retina of an eye?

Answer: There are two kinds of light sensitive cells on the retina. (i) cones, which are sensitive to bright light and (ii) rods, which are sensitive to dim light. Besides, cones sense colour.

Long Answer Type Questions

Question 1: What happens when a ray of light falls perpendicularly on the surface of a plane mirror?

Answer: The angle of incidence for such a ray of light is zero. Since the angle of incidence is zero, so according to the law of reflection, the angle of reflection should also be zero. This means that the reflected ray will also travel back from the mirror along the normal.

Question 2: How many images of the coin will be seen when two plane mirrors are set at right angles to each other and a coin is placed in-between these two plane mirrors?

Answer: The formula to calculate the no. of images of an object placed between 2 plane mirrors is (360°/x°)−1; where ‘x’ is the angle of inclination.

(360°/90°)−No. of images formed = (360°/90°)−1 = 4−1 =3

Question 3: What is cataract? How can the vision of a person having cataract be restored?

Answer: Sometimes, particularly in old age, eyesight becomes foggy. It is due to the eye lens becoming cloudy. When it happens, persons are said to have cataract. There is a loss of vision, sometimes extremely severe. It is possible to treat this defect. The opaque lens is removed and a new artificial lens is inserted. Modern technology has made this procedure simpler and safer.

Question 4: Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

Answer: If we are in dark room, then it is not possible for us to see the objects in the room. However objects outside the room are visible to us. This is so, because eyes alone cannot see any object. It is only when light from an object enters our eyes that we see the object. The light may have been emitted by the object, or may have been reflected by it.

Question 5: How does eye adjust itself to deal with light of varying intensity?

Answer: The iris controls the amount of light entering into the eye by automatically adjusting the size of the pupil according to the intensity of the light that the eye receives. If the amount of light is high, the iris contracts the pupil and reduces the amount of light entering the eyes. If the amount of light is less, the iris expands the pupil so that more light can enter the eye and the things can be viewed clearly.

Question 6: Explain why, an owl can see well in the night but not during the day whereas an eagle can see well during day but not in the night.

Answer: A night bird (owl) can see very well in the night but not during the day. On the other hand, day light birds (kite, eagle) can see well during the day but not in the night. The Owl has a large cornea and a large pupil to allow more light in its eye. Also, it has on its retina a large number of rods and only a few cones. The day birds on the other hand, have more cones and fewer rods.

Question 7: Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

Answer: Difference between regular and diffused reflection

Class 8 Science Chapter 16 Light Extra Questions image 1

Question 8: What are the functions of the following parts of the eye? Iris, Eye-lens, Retina and Optic nerve

Iris – Iris controls the size of the pupil. The iris is the part of that eye which gives it its distinctive colour.
Eye-lens – The lens focuses light on the back of the eye, on a layer called retina.
Retina – Retina receives the light focused by the lens. Retina contains several nerve cells. Sensations felt by the nerve cells are then transmitted to the brain.
Optic nerve – The job of the optic nerve is to transfer visual information from the retina to the brain.

Question 9: Explain how you can take care of your eyes.

Answer: It is necessary that we take proper care of our eyes. If there is any problem we should go to an eye specialist. Have a regular checkup.

If advised, we should use suitable spectacles.
Too little or too much light is bad for our eyes. Insufficient light causes eyestrain and headaches. Too much light, like that of the sun, a powerful lamp or a laser torch can injure the retina.
We should not look at the sun or a powerful light directly.
We should not rub our eyes. If something gets into the eyes, we should splash the eyes with a lot of clean water. If there is no improvement then we should consult a doctor.
We should wash our eyes frequently with clean water.
We should always read at the normal distance for vision. We should not read by bringing our book too close to our eyes or keeping it too far.

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NCERT Solutions for Class 8 Science Chapter 16 - Light
NCERT Solutions

NCERT Solutions for Class 8 Science Chapter 16 Light - Free PDF Download

NCERT Solutions for Class 8 Physics Chapter 16 - Light PDF is now available to download for you on the official website of Vedantu. Download the comprehensive PDF of NCERT Solutions to review Class 8 Science Chapter 16 - Light and Class 9 Science crafted by seasoned educators with years of teaching experience, these solutions ensure a thorough understanding of the subject matter. They have a great experience and are experts in explaining the questions as well as giving the solutions and making you understand quickly and easily. Maths Students who are looking for better solutions ,They can download Class 8 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

In case, you have queries, visit the official website of Vedantu and go through the questions and answers then get in touch with the experts or teachers and they will clear all of your doubts.

Access NCERT Solutions for Class 8 Science Chapter 16 – Light

Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.

Ans: In a dark room, one cannot see things in a room, but things outside the room will be visible.

The reason for this is that the object is only visible when light from the object reaches the eye. In a dark room, we cannot see objects because the rays of light do not reach our eyes whereas, in a lighted room, the rays of light reflected from the objects reach our eyes making them visible to us.

Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?

Ans: The difference between regular and diffused reflection is as follows:

Diffused reflection is not due to the failure of the laws of reflection. It is caused by irregularities in the reflecting surface.

Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.

a. Polished wooden table

Ans: A polished surface means the surface is very smooth, thus

regular reflection takes place.

b. Chalk powder

Ans: A diffused reflection takes place on a chalk powder because its surface is uneven.

c. Cardboard surface

Ans: The surface of cardboard that reflects light is not smooth, thus diffused reflection will take place from a cardboard surface.

d. Marble floor with water spread over it

Ans: The water spread over marble makes the surface very

Smooth which makes it act like a plane surface. Hence, regular reflection takes place.

Ans: The surface of the mirror is very smooth and shiny. Therefore, regular reflection takes place.

f. Piece of paper

Ans: A piece of paper may look smooth, but it has many irregularities on its surface. Thus, diffused reflection takes place.

State the laws of reflection.

Ans: Laws of reflection can be stated as follows:

The angle of reflection and angle of incidence is always equal to each other.

The incident ray, the normal at the point of incidence and the reflected ray all lie in the same plane.

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

Ans: To perform this experiment take a plane mirror and place it on a plane sheet of paper in a standing position with a block. Then draw an incidence line AB on this paper. Mark the points on the paper by carefully looking at the mirror. The line that goes after it appears on the screen. Draw a perpendicular on the mirror line and then remove the mirror. Join the points to make the reflected ray on the paper. You will observe that incident ray, reflected ray and normal will be in the same plane, i.e. on the sheet of paper. This verifies the law of reflection.

Fill in the blanks in the following.

a. A person \[1\] m in front of a plane mirror seems to be ____ m away from his image.

Ans: A person \[1\] m in front of a plane mirror seems to be \[2\] m away from his image.

b. If you touch your ________ ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your _________.

Ans: If you touch your left ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your left hand.

c. The size of the pupil becomes ________ when you see in dim light.

Ans: The size of the pupil becomes large when you see it in dim light.

d. Night birds have _________ cones than rods in their eyes.

Ans: Night birds have lesser cones than rods in their eyes.

The angle of incidence is equal to the angle of reflection.

b. Sometimes

c. Under special conditions

Ans: (a) Always

Since the first law of reflection states that the angle of incidence and

the angle of reflection is always equal to each other.

The image formed by a plane mirror is

a. Virtual, behind the mirror and enlarged.

b. Virtual, behind the mirror and of the same size as the object.

c. Real at the surface of the mirror and enlarged.

d. Real, behind the mirror and of the same size as the object.

Ans: (b) Virtual, behind the mirror and of the same size as the object.

The image created by the plane mirror is built behind the mirror. This image cannot be created on screen, so it produces a virtual image of the size that of the object.

Describe the construction of a kaleidoscope.

Ans: The Kaleidoscope is made up of three rectangular squares each about \[15\] cm long and \[4\] cm wide which are joined together to build a prism. They are arranged in a circular cardboard tube. Note that the tube is slightly longer than the screen straps. One end of the tube is closed with a cardboard disc with a hole in the middle. To make the disk last longer, a piece of transparent plastic paper is attached to the bottom of the cardboard disk. At the other end, a round plate of the glass plane is fixed touching the mirrors.

Draw a labelled sketch of the human eye.

Gurmit wanted to perform Activity \[16.8\] using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher’s advice?

Ans: The intensity of the laser light is very high which is harmful to the eye and can cause a permanent defect in the eye. She can lose her eyesight also due to severe damage to the retina. Therefore, it is advisable not to look at a laser beam directly.

Explain how you can take care of your eyes.

Ans: To protect our eyes, the following precautions should be taken:

i. Do not read in too little or too much light.

ii. Wash your eyes frequently with cold water.

iii. Do not read by bringing your book too close to your eyes or keeping it too far.

iv. Never rub your eyes.

v. If particles of dust go into our eyes, wash our eyes with clean water. If there is no improvement go to a doctor.

What is the angle of incidence of a ray if the reflected ray is at an angle of \[{{90}^{\circ }}\] to the incident ray?

Ans: We know that angle of incidence is equal to the angle of reflection. Therefore, twice of incidence angle is equal to \[{{90}^{\circ }}\].

Thus, Angle of incidence \[i=\dfrac{{{90}^{\circ }}}{2}\] .

\[\Rightarrow i={{45}^{\circ }}\]

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by \[40\] cm?

Ans: Since the mirrors are kept parallel to each other, and Infinite no of images will be formed due to multiple reflections between them.

Two mirrors meet at right angles. A ray of light is incident on one at an angle of \[{{30}^{\circ }}\] as shown in Fig. \[16.19\]. Draw the reflected ray from the second mirror.

Ans: From the first law of reflection, The angle of reflection and angle of incidence is always equal to each other.

The diagram of the reflected ray from the second mirror is as follows:

Boojho stands at \[A\] just on the side of a plane mirror as shown in Fig. \[16.20\]. Can he see himself in the mirror? Also, can he see the image of objects situated at \[P,Q,R\]?

Ans: \[A\] cannot see his image as the length of the mirror is too short on his side. He can see the image of the objects at \[P\] and \[Q\] but cannot see the object at \[R\] as can be inferred from the ray diagram.

Solve the below referring to the given diagram.

a. Find out the position of the image of an object situated at \[A\] in the plane mirror.

Ans: The image of \[A\] is formed behind the mirror at the same distance as that of \[A\] from the mirror.

b. Can Paheli at \[B\] see this image?

Ans: Yes, Paheli at \[B\] can see the image.

c. Can Boojho at \[C\] see this image?

Ans: Yes, Boojho at \[C\] can see the image.

d. When Paheli moves from \[B\] to \[C\], where does the image of \[A\] move?

Ans: The image of \[A\] is unaffected by the movement of \[B\] and \[C\]. Therefore, Paheli will be able to see the image of \[A\] while moving from \[B\] to \[C\].

NCERT Solutions for Class 8 Science Chapter 16 – Free PDF Download

If you are looking for the NCERT Solutions for Science Class 8 Chapter 16, then this is the perfect platform for you. The answers are prepared by the experts and are uploaded in PDF format on the official website of Vedantu. It can help you to download the Light Class 8 solutions and find out the answers for the required questions easily.

NCERT Solutions for Science Class 8 Chapter 16

Introduction.

The world is mostly known through the senses. In the NCERT Solutions for Class 8 Science Chapter 16, Why the sense of sight is one of the essential senses is explained. Through it, we see mountains, rivers, trees, plants, chairs, people and so many other things around us. We also see clouds, rainbows and birds flying in the sky. At night we see the moon and the stars. The words and sentences printed on this page. How is seeing made possible?

In the earlier chapters, you must have learnt about some natural phenomena. In this chapter, charging by rubbing is properly explained. The transfer of Charge is also discussed. How to deal with thunderstorms and about the Earthquake? In this chapter, what makes things visible is also explained. The Ch 16 Science Class 8 begins with the Laws of Reflection. NCERT Solutions for Class 8 Science Chapter 16 Light there will be a discussion about the Regular and Diffused Reflection. How does regular reflection form images? If reflected Light can be reflected again, what happens? The Kaleidoscope is also explained properly. You will learn about the colour of the Sun Light — it is white or coloured.

How Visually can Impaired Persons read and write in NCERT Class 8 Science Chapter 16? How can a night bird (owl) see very well in the night but not during the day? On the other hand, why dayLight birds (kite, eagle) can see well during the day but not in the night. What are the things that the owl has that allows more Light in its eye? The most popular resource for a visually challenged person is also explained here. What is the Braille System in the Light chapter Class 8? If you can see an object in a dark room, how is it possible? All of these things are explained here.

The activity that shows the incident ray, the reflected ray and the normal at the point of incidence stay in the same plane. The chapter explains about Image formed by a plane mirror. How can you take care of your eyes? How is the angle of incidence always equal to the angle of reflection? What happens if two plane mirrors are used in combination? What happens if two plane mirrors are used in combination? The idea of the number of images generated by mirrors placed at an angle to one another is utilized to make numerous beautiful patterns.

The process of making a kaleidoscope has been described in the Class 8 Science Chapter 16 solutions. What is there inside our eyes? Why do we see things only when Light coming from them enters our eyes? Why is the eye one of our most important sense organs? Why is it essential to understand its structure and to work? The chapter will discuss the dark, muscular structure of the eye and what a Pupil is. It explains about the cornea and the function of the optic nerve.

In NCERT Solutions Class 8 Science Chapter 16, you will recall what you were taught in your previous class about. You will be rekindled about some natural phenomena and if reflected Light can be reflected again. You will also recall the kaleidoscope and what happens if two plane mirrors are used in combination. Be relinked with the process of making a kaleidoscope, the braille system and with the most popular resources for a visually challenged person. In the NCERT Solutions for Class 8 Science Chapter Light, recall how to take care of your eyes and the colour of the sunLight. Recall the importance of the eye, the structure of an eye, and it’s working and why it is essential to know about it.

The solutions of the Class 8 Science Chapter Light exercise are prepared by our experts, that helps you to understand the questions and answers easily.

Based on your understanding of what you have learnt until now, you will have to find out the solutions by explaining every minute detail. In order to find out the NCERT Solutions for Class 8 Science CH 16, you can access the PDF file to find the NCERT Solution of Class 8 Science Chapter 16 that is prepared by experts to learn more.

Key Features of NCERT Solutions for Class 8 Science Chapter 16

Students must go through these Class 8th Science Chapter 16 solutions so that they can fetch good marks in the exams. These NCERT Solutions for Class 8 Science Chapter 16 Light are prepared by our experts who have the right experience in this field.

Comprehensive explanations for each exercise and questions, promoting a deeper understanding of the subject.

Clear and structured presentation for easy comprehension.

Accurate answers aligned with the curriculum, boosting students' confidence in their knowledge.

Visual aids like diagrams and illustrations to simplify complex concepts.

Additional tips and insights to enhance students' performance.

Chapter summaries for quick revision.

Online accessibility and downloadable resources for flexible study and revision.

Chapter wise NCERT Solutions for Class 8 Science

Chapter 1 - Crop Production and Management

Chapter 2 - Microorganisms : Friend and Foe

Chapter 3 - Synthetic Fibres and Plastics

Chapter 4 - Materials : Metals and Non-Metals

Chapter 5 - Coal and Petroleum

Chapter 6 - Combustion and Flame

Chapter 7 - Conservation of Plants and Animals

Chapter 8 - Cell - Structure and Functions

Chapter 9 - Reproduction in Animals

Chapter 10 - Reaching The Age of Adolescence

Chapter 11 - Force and Pressure

Chapter 12 - Friction

Chapter 13 - Sound

Chapter 14 - Chemical Effects of Electric Current

Chapter 15 - Some Natural Phenomena

Chapter 16 - Light

Chapter 17 - Stars and The Solar System

Chapter 18 - Pollution of Air and Water

Along with this, students can also view additional study materials provided by Vedantu, for Class 8 :

NCERT Exemplar for class 8 Science Chapter 16

CBSE Revision Notes for class 8 Science Chapter 16

The NCERT Solutions for Class 8 Science Chapter 16 - Light, provided by Vedantu, is a valuable tool for Class 8 students. It helps introduce Science concepts in an accessible manner. The provided solutions and explanations simplify complex ideas, making it easier for Class 8 Students to understand the material. By using Vedantu's resources, Students can develop a deeper understanding of NCERT concepts. These solutions are a helpful aid for grade 8 students, empowering them to excel in their studies and develop a genuine appreciation for the chapter “Light”.

FAQs on NCERT Solutions for Class 8 Science Chapter 16 - Light

1. Mention which one of them will have a diffused reflection when exposed to strikes.

Polished table

Cardboard Surface

Marble flooring

Reflection occurs only in the places that have plane surfaces and polished or even surfaces. Therefore, the mirror, marble flooring, and polished table will have reflections.

2. What are the Laws of Reflection?

The laws of reflection are stated below:

The incident ray, the reflected ray, and the normal ray all will lie in the same place.

3. What are the topics covered under NCERT Solutions for Class 8 Science Chapter 16?

Under Chapter 16 of Class 8 Science, several topics have been covered. These are all based on a basic understanding of Light. Questions like what makes things visible are discussed. On a more technical note, the laws of reflection are discussed along with regular and diffused reflection. The concept of multiple images is explained in simple terms. A basic layout of the structure of the eye is also given. To know more, visit the page NCERT Solutions Class 8 Science.

4. What is the Braille system as discussed in the chapter?

The Braille system is defined as a helpful resource for visually challenged people that allows them to read and write. The system as it is presently used was adopted in the year 1932. There is unique Braille code that is different for common languages, for mathematics and for scientific notation. Many Indian languages can also be read by blind people by using the Braille system.

5. Who is Helen Keller?

Helen Keller was a visually impaired girl who beat all odds to complete her graduation. She went on to author several books along with her autobiography named The Story Of My Life. Even though she lost her sight at the tender age of 18 months, this American author did not lose her courage. Her life is an inspiration to many blind people.

6. How is reflected light useful?

Objects either radiate light of their own or they reflect it. Most objects simply reflect light. Nearly everything we see around us is visible solely due to reflected light. Even celestial bodies like the moon simply reflect the light of the sun, which is a luminous body that creates its own light source. For further clarity on this concept or to download NCERT solutions for free, visit the page NCERT Solutions Class 8 Science on the Vedantu website or download the Vedantu app.

7. What are the benefits of using the NCERT Solutions for Class 8 Science Chapter 16?

Using Vedantu's NCERT Class 8 Science Chapter 16 Solutions helps acquaint students with the kind of questions that are important from the examination point of view. It also helps them identify weak points and topics that they might need to work more on. Practicing these questions regularly can yield great results and help students ace their school examinations. Visit the above page to access these solutions.

NCERT Solutions for Class 8 Science Chapter 16 Light

Chapter 16 Light Class 8 Science NCERT Solutions

Class 8 science chapter 16 light ncert questions and answers - topics, chapter 16 light ncert solutions for class 8 science - notes, chapter 16 light class 8 science questions and answers - mcq questions with answers, contact form.

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High School Physics

Light Class 8 Numericals – solved numerical questions

Last updated on July 4th, 2023 at 02:07 pm

In this post, we will solve Numerical problems based on the Light chapter of class 8 science . Here, first, we will go through the law of reflection & related formulas, and then attempt the numerical questions. Solution & answer is given for all the numerical questions.

Formulas Used

1 ] According to the law of reflection , Angle of incidence <i = Angle of reflection <r 2] Angle of incidence = angle between the normal and incident ray 3] Angle of reflection = angle between the normal and reflected ray 4] Angle between Normal and plane mirror = 90 0

Light Class 8 Numericals – Questions and Answers

1. If the reflected ray makes an angle of 600 with the normal, what angle must the incident ray make with the normal?

The angle of reflection = <r = 60 0 . The angle of incidence = <i =?

According to the law of reflection, <i = <r But r = 60 0 Hence, <i= 60 0 The incident ray will make an angle of 60 0 with the normal.

2. If the angle between the incident ray and the reflected ray is 90 0 , what are the values of the angle of incidence and angle of reflection?

Given: The angle between the incident ray and the reflected ray is 90 0 . i.e. <i + <r = 90 0 ………….(1) According to the law of reflection, <i = <r ………….(2)

<i + <i = 90 0 =>2 <i = 90 0 So, <i= 45 0 The angle of incidence is 45 0 and hence, the angle of reflection is also 45 0 .

3. The angle between the plane mirror and incident ray is 35 0 , what is the angle of incidence and angle of reflection?

To solve this numerical the above figure will be helpful.

The angle between the plane mirror and the incident ray is 35 0 So, the angle between the normal and incident ray is = 90 0 – 35 0 = 55 0 This is actually the angle of incidence. According to the law of reflection, the angle of reflection = angle of incidence = 55 0 Answer: angle of reflection = angle of incidence = 55 0

4. What angle will the reflected ray make with the mirror if the angle of incidence is 40 0 ?

The angle of incidence = 40 0 So, the angle of reflection = 40 0 The angle of reflection = angle between the reflected ray and the normal = 40 0 So, the angle between the reflected ray and the mirror = 90 0 – 40 0 = 50 0

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Case Study Questions for Class 7 Science Chapter 15 Light

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[Download] Case Study Questions for Class 7 Science Chapter 15 Light

Here we are providing case study or passage-based questions for class 7 science chapter 15 Light .

Case Study/Passage Based Questions

Lenses are transparent and light can pass through them. Lenses are classified as convex lens and concave lens and we can distinguish between these two types of lenses by just touching them. Lenses are widely used in various appliances that we come across in our daily life. 1. The lenses used in spectacles of a person are found to the thick in the middle but thinner at the edges. The lens used are (a) convex (b) concave (c) plane (d) none of these 2. The image formed by a lens is always erect, virtual and smaller in size than the object. The lens is (a) convex (b) concave (c) plane (d) none of these 3. The image formed by magnifying glass is (a) real (b) virtual (c) either real (d) none of these is or virtual correct

What is case study question for class 7 science.

Case study or passage-based questions in class 7 Science typically require students to read a given scenario or passage and answer questions based on the information provided. These questions assess students’ comprehension, analytical thinking, and application of scientific concepts.

Best Ways to Prepare for Case Study Questions

To develop a strong command on class 6 Science case study questions, you can follow these steps:

Read the textbook and study materials: Familiarize yourself with the concepts and topics covered in your class 6 Science curriculum. Read the textbook thoroughly and take notes on important information.
Practice analyzing case studies: Look for case studies or passages related to class 6 Science topics. Analyze the given information, identify key details, and understand the context of the situation.
Develop comprehension skills: Focus on improving your reading comprehension skills. Practice reading passages or articles and try to summarize the main points or extract relevant information. Pay attention to details, vocabulary, and the overall structure of the passage.
Understand scientific concepts: Ensure that you have a solid understanding of the scientific concepts discussed in class. Review the fundamental principles and theories related to each topic.
Make connections: Try to connect the information provided in the case study to the concepts you have learned in class. Identify any cause-effect relationships, patterns, or relevant scientific principles that apply to the situation.
Practice critical thinking: Develop your critical thinking skills by analyzing and evaluating the information given in the case study. Think logically, consider multiple perspectives, and draw conclusions based on the evidence provided.
Solve practice questions: Look for practice questions or sample case study questions specifically designed for class 6 Science. Solve these questions to apply your knowledge, practice your analytical skills, and familiarize yourself with the format of case study questions.
Seek clarification: If you come across any challenging concepts or have doubts, don’t hesitate to ask your teacher for clarification. Understanding the underlying principles will help you tackle case study questions effectively.

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Class 8 Science Case Study Question Chapter 1 to 18
CBSE Class 8 Science Case Study Question. Chapter 1 Crop Production and Management Case Study Question. Chapter 2 Microorganisms: Friend and Foe Case Study Question. Chapter 3 Synthetic Fibres and Plastics Case Study Question. Chapter 4 Materials: Metals and Non-Metals Case Study Question.
Light Class 8 Extra Questions Science Chapter 16
Answer: Irregular reflection is defined as the reflection of light from an uneven surface. In irregular reflection, the reflected beam is not parallel. Question 8. List the characteristics of an image formed in a plane mirror. Answer: he characteristics of an image formed in a plane mirror are: It is virtual.
Important Questions Class 8 Science Chapter 16
Below are a few questions and their solutions from our question bank of Important Questions Class 8 Science Chapter 16. Question 1. Image formed in a plane mirror undergoes _______________. Answer 1. lateral inversion. The reversal of a mirror image, where the object's right side appears on the left side behind the mirror, is known as lateral ...
Class 8 Science Case Study Question
CBSE Class 8 Science Case Study Question. Chapter 1 Crop Production and Management Case Study Question. Chapter 2 Microorganisms: Friend and Foe Case Study Question. Chapter 3 Synthetic Fibres and Plastics Case Study Question. Chapter 4 Materials: Metals and Non-Metals Case Study Question.
Category: Case Study Questions for Class 8 Science
Case Study Questions for Class 8 Science Archives - Gurukul of Excellence. Q-104, Sector-38, Gurgaon, Haryana 07065827902 [email protected] M-F: 8 AM- 8 PM; Weekend: 10 AM-2 PM.
Light Class 8 Important Questions and Answers
Important Questions of Class 8 Science Chapter 16 Light. Here you can get Class 8 Important Questions Science based on NCERT Text book for Class 8. Science Class 8 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Light for Class 8 Science subject. Very Short Answer Questions. 1.
Class 8 Important Questions for Science
Here you can get Class 8 Important Questions Science based on NCERT Text book for Class VIII. Science Class 8 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Light for Class 8 Science subject. Science Important Questions Class 8 are given below. Multiple Choice Questions
Chapter 13: Light
Answer. (a) Polished wooden table — Regular reflection. Reason — The polished wooden table has a smooth surface, hence, the reflections are regular. (b) Chalk powder — Diffused reflection. Reason — Chalk powder spread on a surface will form an irregular surface, hence, the reflections are diffused.
Important Questions for CBSE Class 8 Science Chapter 16
For simplicity, the term ray is used for a narrow beam of light. 16. Give any two uses of periscope. Ans: Submarines, tanks, and soldiers in bunkers use periscopes to see things outside. 17. ___________ system helps visually challenged persons to read and write. Ans: Braille.
NCERT Exemplar Class 8 Science Chapter 16 Light
NCERT Exemplar Class 8 Science Chapter 16 Light. Multiple Choice Questions (MCQs) Question 1. Part of the eye which controls the entering of light is called. (a) iris (b) cornea. (c) lens (d) retina. Answer. (a) Iris is a dark muscular structure behind the cornea, which controls the amount of light entering into the eye. Question 2.
Light Class 8
It has everything you will need. Check out the NCERT Solutions, Notes, Experiments, Activities and some Extra Questions for Chapter 16 Class 8 Science - Light.Everything is provided free of cost, and is the best education material available for Light Class 8.In this chapter, we will study -How do weseeobjects?What arevisible and in.
Light Class 8 Science Extra Questions and Answers
Very Short Answer Type Question. Question 1: Name a device which works on the reflection of reflected light. Answer: Periscope. Question 2: Name the point inside the human eye where no vision is possible. Answer: Blind spot. Question 3: Name an eye disease caused by the deficiency of vitamin A in the diet.
CBSE Class 8 Science Light Competency Based Questions
This section on Competency Based Questions has been incorporated in the curriculum in view of the National Education Policy (NEP) 2020. It includes Multiple Choice Questions, Case-based Questions, Assertion-Reasoning Questions, and even Source-Based Questions to help the students undergo an intelligent preparation process.
Important Questions For Class 8 Science Chapter 16 Light
1. What is the Band of seven colours? 2. ______ is not a source of light. 3. If light falls perpendicularly on a plane mirror, at what angle will it be reflected? 4. The difference in colour of the eye is caused by the difference in____. Important Questions For Class 8 Science Chapter 16 Light are provided here which can help the students to ...
light class 8 notes CBSE
These Light class 8 notes, explanations, examples, and questions and answers are according to CBSE and the NCERT textbook. If you like the study material, feel free to share the link as much as possible. Table of Content. Introduction to Reflection. Reflection of light on a plane surface. Laws of Reflection. Formation of image by a plane mirror.
NCERT Solutions for Class 8 Science Chapter 16
It can help you to download the Light Class 8 solutions and find out the answers for the required questions easily. NCERT Solutions for Science Class 8 Chapter 16 Introduction. The world is mostly known through the senses. In the NCERT Solutions for Class 8 Science Chapter 16, Why the sense of sight is one of the essential senses is explained.
NCERT Solutions for Class 8 Science Chapter 16 Light
Light Class 8 Science NCERT Intext Activities Solved. Activity 1 (NCERT Textbook, Page 199) Fix a white sheet of paper on a drawing board or a table. Take a comb and close all its openings except one in the middle. You can use a strip of black paper for this purpose. Hold the comb perpendicular to the sheet of paper.
Chapter 16 Light Class 8 Notes
Light Class 8 Notes - Chapter 16. Introduction to Light Laws of Reflection Regular and Diffused Reflection Dispersion Human Eye Visual Defects Seeing Sans Eyes Frequently Asked Questions on CBSE Class 8 Science Notes Chapter 16 Light. According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 13.
NCERT Solutions for Class 8 Science Chapter 16 Light
Chapter 16 Light Class 8 Science NCERT Solutions will prepare yourself well before examinations and help in improving the student's experience. These are helpful in building a great foundation of concepts and make easy for the students to understand basics. It can be used to enrich knowledge and make lessons for learners more exciting.
NCERT Solutions for Class 8 Science Chapter 16 Light
The NCERT Solutions for Class 8 are created by subject experts according to the latest CBSE syllabus. It consists of answers to the textbook questions, extra questions, exemplary problems, worksheets and questions from the previous years' question papers. Subtopics of NCERT Class 8 Science Chapter 16 Light. What Makes Things Visible; Laws of ...
Chapter 16: Light for Class 8
8 minute read. In chapter 16 of Class 8 NCERT Science book, we find the topic of 'Light'. The chapter explains light, its properties and its uses. It is another enjoyable chapter that is informative as well. In this blog, we will read some of the important notes on Class 8 Light. Also Read: Class 8 Science.
Light Class 8 Numericals
Solution: The angle of incidence = 40 0. So, the angle of reflection = 40 0. The angle of reflection = angle between the reflected ray and the normal = 40 0. So, the angle between the reflected ray and the mirror = 90 0 - 40 0 = 50 0. In this post, we will solve Numerical problems & questions based on the Light chapter of class 8 science ...
Case Study Questions for Class 7 Science Chapter 15 Light
Here we are providing case study or passage-based questions for class 7 science chapter 15 Light. Case Study/Passage Based Questions. Passage-1. Lenses are transparent and light can pass through them. Lenses are classified as convex lens and concave lens and we can distinguish between these two types of lenses by just touching them.

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