NCERT Solutions for Class 8 Science Chapter 16
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Class 8 Science Chapter 16 Exercises Answers
Important Questions with answers
1. Part of the eye which controls the light entering is called
2. 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.
3. 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.
4. How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?
5. 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?
6. What kind of lens is there in our eyes? Where does it form the image of an object?
7. How is the phenomenon of reflection used in making a kaleidoscope? What are the applications of a kaleidoscope?
8. Which part of the eye gets affected if someone is suffering from cataract? How is it treated?
- 1 (a)
- 2 (b)
- 3 (b)
- 4 Infinite number of times.
- 5 12 cm.
- 6 The type of lens in our eyes is convex. It forms images on the retina.
- 7 The kaleidoscope gives a number of images formed by reflection from the mirrors inclined to one another. Designers and artists use kaleidoscope to get ideas for new patterns to design wallpapers, Jewellery and fabrics.
- 8 In people suffering from cataract the eye lens becomes clouded. Cataract is treated by replacing the opaque lens with a new artificial lens.