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[" A ray of light from a denser medium strikes a "],[" rarer medium at an angle of incidence i.If the "],[" reflected and refracted rays are mutually "],[" perpendicular to each other,what is the value "],[" of critical angle? "],[[" (A) "sin^(-1)(" cot i) "," (B) "sin^(-1)(tan" i) "],[" (C) "cos^(-1)(cot i)," (D) "cos^(-1)(tan1)]]

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