In a Michelson experiment for measuring speed of light,

Question:

In a Michelson experiment for measuring speed of light, the distance travelled by light between two reflections from the rotating mirror is $4.8 \mathrm{~km}$. 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?

Solution:

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