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The refractive index of the material of ...

The refractive index of the material of a prism is `sqrt(2)` and its prism angle is `30^(@)` One of its refracting faces is polished .The incident beam of light will return back for the angle of incidence

A

`60^(@)`

B

`45^(@)`

C

`30^(@)`

D

`0^(@)`

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