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A ray of light is incident at an angle i from denser to rare medium. The reflected and the refracted rays are mutually perpendicular. The angle of reflection and the angle of refraction are respectively r and r ’ , then the critical angle will be

1. ) (sin sin 1 r 
2. ) ' (tan sin 1 r 
3. ) (tan sin 1 i 
4. ) (sin tan 1 i 

Correct answer: ) (tan sin 1 i 

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