Question

4. What would be the angle of reflection, if an incident ray makes an angle of 70° with
the normal of the plane mirror?
b. 50°
C. 70°
d. 100
5. Which of the following device is based on multiple reflection?
b. Kaleidoscope
c. Periscope
d. Both (b) and (c)
6. Which lens is used in spectacles for the correction of near-sightedness?
b. Concave c. Both (a) and (b) d. None of these
7. When two plane mirrors are kept at 60° to each other, we get
a. 3 images
b. 4 images
c. 5 images
d. 6 images
8. What is the minimum distance which a normal human eye can see distinctly?
a. 25 cm
b. 25 m
d. 2.5 m
d. 2.5 cm
9. For two parallel mirrors facing each other, the number of images formed are:
b. 10
d. infinite
a. Convex
c. 6
a. 20​

Answer 1

Answer:

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Answer 2

Answer:

4.

c. 70 °

5.

d. both b and c

6.

b. concave

7.

c. 5 images

8.

a. 25cm

9. d. infinite

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