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16. Light Science class 8 in English Medium ncert book solutions Text Book Exercise
16. Light Text Book Exercise – Complete NCERT Book Solutions for Class 8 Science (English Medium). Get all chapter explanations, extra questions, solved examples and additional practice questions for 16. Light Text Book Exercise to help you master concepts and score higher.
16. Light Science class 8 in English Medium ncert book solutions Text Book Exercise
NCERT Solutions for Class 8 Science play an important role in helping students understand the concepts of the chapter 16. Light clearly. This chapter includes the topic Text Book Exercise , which is essential from both academic and examination point of view. The solutions provided here are prepared strictly according to the latest NCERT syllabus and follow the guidelines of CBSE to ensure accuracy and relevance. Each question is explained in a simple and student-friendly manner so that learners can grasp the concepts without confusion. These NCERT Solutions are useful for regular study, homework help, and exam preparation. All textbook questions are solved step by step to improve problem-solving skills and conceptual clarity. Students of Class 8 studying Science can use these solutions to revise important topics, understand difficult questions, and practise effectively before examinations. The chapter 16. Light is explained in a structured way, making it easier for students to connect the theory with the topic Text Book Exercise . By studying these updated NCERT Solutions for Class 8 Science, students can build a strong foundation, boost their confidence, and score better marks in school and board exams.
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
See other sub-topics of this chapter:
1. Chapter Review 2. Text Book Exercise 3. Text Book Exercise 4. Additional Questions With Solutions 5. Additional Questions With Solutions