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Question

In a Michelson experiment for measuring speed of light, the distance traveled by light between two reflections from the rotating mirror is 4.8 km. The rotating mirror has a shape of a regular octagon. At what minimum angular speed of the mirror (other than zero) the image is formed at the position where a non-rotating mirror forms it?

A
780 rev/s
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B
7800 rev/s
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C
690 rev/s
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D
7500 rev/s
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Solution

The correct option is D 7800 rev/s
Minimum angular speed f=cdN

=3×1084.8×103×8
=7812rev/s7800rev/s

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