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The angle of a prism is A. One of its re...

The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first returns back through the same path after sufferin reflection at the silvered surface. The refractive index `mu`, of the prism

A

`1/2 cosA`

B

tan A

C

2 sin A

D

2 cos A

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The correct Answer is:
D
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