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Question

A torch producing a straight light beam falling on a plane mirror at an angle 60o. The reflected beam make a spot P on the screen along Y-axis. If at t=0, mirror starts rotating about the hinge A with an angular velocity Ω=1o per second clockwise. Find the speed of the spot on screen after time t=15s.

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Solution


v=2v0
=2 (double of the speed of mirror)
=2(20 per sec)
=220 per sec

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