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A ray of light passes from vaccuum to a ...

A ray of light passes from vaccuum to a medium refractive index `mu`. The angle of incidence is found to be twice the angle of refraction. The angle of refraction is

A

`cos^-1(mu/2)`

B

`cos^-1(mu)`

C

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

D

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

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