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The angle at which a ray of light be inc...

The angle at which a ray of light be incident on one face of an equilateral prism,so that the emergent ray may graze the second surface of the prism is `pi/x` rad.then find "x" ."`(`mu=2`)]

A

`30^(@)`

B

`90^(@)`

C

`45^(@)`

D

`60^(@)`

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The correct Answer is:
B
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