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A right angled prism is to be made by se...

A right angled prism is to be made by selecting a proper material and the angles A and B `(BleA), as shown in figure. It is desired that a ray of light incident on the face AB emerges parallel to the incident direction after two internal reflections.

(a) What should be the minimum refractive index n for this to be possible?
(b) For `n=5/3` is it possible to achieve this with the angle B equal to `30` degrees?

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