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A ray of light from a denser medium stri...

A ray of light from a denser medium strikes a rare medium as shown in figure. 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)(cotr)`

D

`tan^(-1)(sinr')`

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The correct Answer is:
A
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