# Are you smarter than me? (OPTICS)

Algebra Level pending

A light ray incident on a rotating mirror $$M$$ is returned to a fixed mirror $$N$$ placed 22.5 km away from $$M$$. The fixed mirror reflects it back to $$M$$ (along the same path) which in turn reflects the light again along the direction that makes an angle of $$27^\circ$$ with the incident direction. Find the speed of the rotation of the mirror in revolutions per second.

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