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16. Light-Text Book Exercise Science Class 8 In English
Last Updated : 06 March 2026
Explore science Solutions for Class 8 Chapter 16. Light Topic Text Book Exercise in English medium.
16. Light-Text Book Exercise Science Class 8 In English
Last Updated : 06 March 2026
16. Light-Text Book Exercise Science Class 8 In English
16. Light
Text Book Exercise
Exercise - Question:
Que: Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room. Explain.
Ans: When we are in a dark room then we cannot see objects in the room. We can see the objects outside the room, because out of the room the light is available and the rays of light can enter our eyes after reflection from the objects.
Que: Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
Ans:
| Regular Reflection | Diffused Reflection |
| (i) All the reflected rays are parallel. | (i) The reflected rays are not parallel. |
| (ii) It occurs on a smooth and polished surface. | (ii) It occurs on the rough surface. |
| (iii) Reflected rays are in one direction. | (iii) Reflected rays are scattered in different directions. |
No, diffuse reflection doesn’t mean the failure of laws of reflection.
Que: 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
(c) Cardboard surface
(d) Marble floor with water spread over it
(e) Mirror
(f) Piece of paper
Ans:
1. Regular reflection will take place because the surface is plane and polished.
2. Diffused reflection will take place because the surface is rough.
3. Diffused reflection will take place because the surface is rough.
4. Regular reflection will take place because the surface is smooth and plane.
5. Regular reflection will take place because the surface is plane and polished.
6. Diffused reflection will take place because the surface is rough.
Que: State the laws of reflection.
Ans: The laws of reflections are:
- The incident ray, the normal and the reflected ray, all lie in the same plane.
- The angle of incidence is equal to the angle of reflection.
Que: 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: Activity: To show that the incident ray, reflected ray and the normal at the point of incidence lie in the same plane.
Materials Required: Plane mirror, holder, ray box, etc.
Procedure: Fix sheet of white paper, a little beyond the edge of the board. Place a plane mirror strip vertically to the paper using a stand. Throw light from a ray box on the mirror. Look at the reflected ray. Mark the incident ray, normal ray and reflected ray. Fold the paper which is beyond the edge of the board. You will observe that the reflected ray is not seen in the folded portion of the chart paper. Now bring the folded portion back to its original position. The reflected ray of light is again seen on the page Conclusion: The sheet on the board can be considered as a plane. The incident ray, the reflected ray, the normal at the point of incidence lie in the same plane.
Incident ray, reflected ray and normal at the point of incidence lie in the same plane.
Que: Fill in the blanks in the following:
(a) A person 1 m in front of a plane mirror seems to be _______________ m from his image.
(b) If you touch your ____________ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with ____________
(c) The size of the pupil becomes ____________ when you see in dim light.
(d) Night birds have ____________ cones than rods in their eyes.
Ans:
(a) 2
(b) left, left hand
(c) larger
(d) lesser
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NCERT Solutions for Class 8 science Chapter 16. Light Topic Text Book Exercise
NCERT Solutions for Class 8 science Chapter 16. Light Topic Text Book Exercise are prepared to help students understand important concepts of the chapter in a simple and clear manner. These solutions are based on the latest CBSE syllabus and follow the official NCERT textbooks. Students who are searching for accurate answers and step-by-step explanations can use these solutions to improve their learning and prepare better for school exams as well as board examinations.
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About Chapter 16. Light of Class 8 science
Chapter 16. Light is an important part of the Class 8 science syllabus. This chapter explains several key concepts which are essential for understanding the subject in detail. Students often face difficulties while solving textbook questions related to this chapter. That is why NCERT Solutions for Chapter 16. Light are provided to explain every concept in a simple and structured way.
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Understanding Topic: Text Book Exercise
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16. Light-Text Book Exercise Science Class 8 In English
Hindi Medium Students/Teachers/Tutors:
All Chapters science Class 8
Class Wise NCERT Solutions
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- NCERT Solutions for Classes 6 to 8 – Ideal for building strong basic concepts.
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16. Light-Text Book Exercise Science Class 8 In English Study Materials For Class 6 to 12
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