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The refractive index of the material of ...

The refractive index of the material of a prism is `sqrt2` and the angle of the prism is 30°. One of the two refracting 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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