An incident ray of light is falling on a plane mirror and getting reflected on a screen. If the mirror is now rotated with angular speed 20 rad/sec by keeping the incident ray fixed, then at what angular speed the reflected ray would be rotating?

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20 rad/sec

10 rad/sec

12.5 rad/sec

40 rad/sec

answer is D.

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Detailed Solution

The angular speed of the reflected ray is twice the angular speed of the mirror when the incident ray of light is kept fixed.

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