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The refractive index of the material of ...

The refractive index of the material of a prism is `sqrt(2)` and the angle of the prism is `30^(@)` .One of the two refraction surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering. The prism from the other face will retrace its path ( after reflection from the silvered surface ) if its angle of incidence on the prism is

A

`60^(@)`

B

`45^(@)`

C

`30^(@)`

D

Zero

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The correct Answer is:
B
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