NCERT Exemplar Class 8 Science Chapter 16: Light. NCERT Exemplar Solutions for Class 8 Science Chapter 16 Light prepare students for their Class 8 exams thoroughly.
Science problems and solutions for the Class 8 pdf are provided here which are similar to the questions being asked in the previous year’s board.
Contents
NCERT Exemplar Class 8 Science Chapter 16: Light
Class 8: Science Chapter 16 solutions. Complete Class 8 Science Chapter 16 Notes.
Multiple Choice Questions
- Part of the eye which controls the light entering is called
- (a) iris
- (b) cornea
- (c) lens
- (d) retina
- We can see a non-luminous object when light:
- (a) emitted by the object falls on the eye.
- (b) is reflected from the object towards our eye.
- (c) completely passes through the object.
- (d) gets completely absorbed by the object.
- Light is falling on surface S1, S2, S3 as shown in Fig.16.1.
Surfaces on which the angle of incidence is equal to the angle of reflection is/are- (a) S1 only
- (b) S1 and S2 only
- (c) S2 and S3
- (d) all the three surfaces
- A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in Fig.16.2 as A, B, C and D. In which position mirror will be visible?
- a. A
- b. B
- c. C
- d. D
- A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in Fig. 16.3. The pencil of light coming out of the hole falls on a mirror.
At which point should the eye be placed so that the hole can be seen?- (a) A
- (b) B
- (c) C
- (d) D
- Two mirrors A and B are placed at right angles to each other as shown in Fig.16.4.
A ray of light incident on mirror A at an angle of 250 falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be- (a) 250
- (b) 500
- (c) 650
- (d) 1150
- Which of the following statements is correct regarding rods and cones in the human eye?
- (a) Cones are sensitive to dim light.
- (b) Cones are sensitive to bright light.
- (c) Rods are sensitive to bright light.
- (d) Rods can sense colour.
- In the figure of the human eye (Fig.16.5), the cornea is represented by the letter
- (a) A
- (b) B
- (c) C
- (d) D
Very Short Answer Type Questions
- Name the part of the eye which gives colour to the eyes.
- Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?
- How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?
- The angle between incident ray and reflected ray is 60°. What is the value of angle of incidence?
- The distance between the object and its image formed by a plane mirror appears to be 24 cm. What is the distance between the mirror and the object?
Short Answer Type Questions
- What happens to light when it gets dispersed? Give an example.
- Draw Fig.16.6 showing the position of the plane mirror. Also label the angle of incidence and angle of reflection on it.
- Look at Fig.16.7. Can the image of the child in it be obtained on a screen?
- Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?
- What kind of lens is there in our eyes? Where does it form the image of an object?
- Which part of the eye gets affected if someone is suffering from cataract? How is it treated?
Long Answer Type Questions
- Boojho planned an activity to observe an object A through pipes as shown in Fig. 16.8, so that he could see objects which he could not directly see.
- (a) How many mirrors should he use to see the objects?
- (b) Indicate the positions of the mirrors in the figure.
- (c) What must be the angle with respect to the incident light at which he should place the mirrors?
- (d) Indicate the direction of rays in the figure.
- (e) If any of the mirrors is removed, will he be able to see the objects?
- There is a mistake in each of the following ray diagrams given as Fig. 16.9 a, b, and c. Make the necessary correction (s).
- Explain the process which enables us to perceive motion in a cartoon film.
- How is the phenomenon of reflection used in making a kaleidoscope? What are the applications of a kaleidoscope?
- Fig. 16.10 shows the word REST written in two ways in front of a mirror. Show how the word would appear in the mirror.
- Write down the names of parts of the eye in the blank spaces shown in Fig. 16.10.
Answers to Multiple Choice Questions
Mutiple Choice Questions
Very Short Answer Questions
