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The critical angle for the material of a...

The critical angle for the material of a prism is `45^@` and its refracting angle is `30^@`. A monochromatic ray goes out perpendicular to the surface of emergence from the prism. What is the angle of incidence on the prism ?

A

`30^@`

B

`45^@`

C

`60^@`

D

`75^@`.

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