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A parallel beam of light is incident fro...

A parallel beam of light is incident from air at an angle `alpha` on the side PQ of a right angled triangular prism of refractive index `n=sqrt2`. Light undergoes total internal reflection in the prism at the face PR when `alpha` has a minimum value of `45^@`.
The angle `theta` of the prism is `

A

`15^@`

B

`22.5^@`

C

`30^@`

D

`45^@`

Text Solution

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The correct Answer is:
A
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