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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a
20 rad/sec
b
10 rad/sec
c
12.5 rad/sec
d
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.