SaraNextGen Study App [2023-24]
Last Updated On [03-11-2023]

A small plane mirror placed at the centre of a spherical screen of radius . A beam of light is falling on the mirror. If the mirror makes  revolution per second, the speed of light on the screen after reflection from the mirror will be

a)

b)

c)

d)


Question ID - 152987 :-

A small plane mirror placed at the centre of a spherical screen of radius . A beam of light is falling on the mirror. If the mirror makes  revolution per second, the speed of light on the screen after reflection from the mirror will be

a)

b)

c)

d)

1 Answer
5876 Votes
3537

Answer Key : (a) -

(a)

When plane mirror rotates through an angle , the reflected ray rotates through an angle . So spot on the screen will make  revolutions per second



Next Question :

Two lenses are placed in contact with each other and the focal length of combination is . If the focal length of one is , then the power of the other will  be

a)

1.66

b)

4.00

c)

d)


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