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 (frac(mu)(2))`

B

`cos^-1 (2mu)`

C

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

D

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

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