Optics Question 114

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

Options:

A) 4pnR

B) 2pnR

C) $ \frac{nR}{2\pi } $

D) $ \frac{nR}{4\pi } $

Show Answer

Answer:

Correct Answer: A

Solution:

When plane mirror rotates through an angle q, the reflected ray rotates through an angle 2q. So spot on the screen will make 2n revolution per second.



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