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A light beam is incident at an angle twi...

A light beam is incident at an angle twice the angle twice the angle of refraction. The angle of refraction is

A

`2 cos^(-1) ((mu)/(2))`

B

`cos^(-1) (2mu)`

C

`(1)/(2) cos^(-1) ((mu)/(2))`

D

`cos^(-1)"(mu)/(2)`

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The correct Answer is:
D
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