A glass cube has side length a and its r...

A glass cube has side length a and its refractive index is `mu = (3)/(2)` . A ray of light (AB) is incident normally on one of its face and after passing through the cube it forms a spot S on screen `sigma`. The cube begins to rotate with angular speed `omega` about its central axis as shown in the Figure. Immediately after the cube begins to rotate, find the speed of the spot S on the screen.

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The correct Answer is:

`(a omega)/(3)`

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