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A ray of monochromatic light is incident...

A ray of monochromatic light is incident on one refracting face of a prism of angle `75^(@)`. It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is `sqrt2` , the angle of incidence on the first face of the prism is

A

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`0^(@)`

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The correct Answer is:
b
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