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     EduGorilla 
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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 90o 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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