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A ray of light from a rarer medium strik...

A ray of light from a rarer medium strikes a denser medium.
The reflected and refracted rays make an angle of `90^@` with each other .the angles of reflection and refraction are r and r' .The critical angle would be

A

`sin^(-1) (tanr)`

B

`tan^(-1)(sinr)`

C

`sin^(-1)(tanr')`

D

`tan^(-1) (sin r')`.

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