A ray of light from a denser medium strikes a rarer medium at an angle of incidence i. The reflected….

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A ray of light from a denser medium strikes a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of 90^o with each other. The angles of reflection and refraction are r and r', respectively. The critical angle is

Options :-

1. sin^–1 (tan r)
2. sin^–1 (tan i)
3. sin^–1 (cot r)
4. sin^–1 (cot i)

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