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The critical angle for two media of refractive indices of medium 1 and 2 given by 2 and 1 respectively is(a) 0(b) 30(c) 45(d) 60This question was addressed to me in an online quiz.My question is taken from Snell Law and Critical Angle topic in section EM Wave Propagation of Electromagnetic Theory |
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Answer» CORRECT OPTION is (b) 30 The explanation is: The sine of the critical angle is the ratio of REFRACTIVE index of medium 2 to that in medium 1. Thus sin θc = n2/n1. To get θc, put n1 = 2 and n2 = 1. Thus we get θc = sin^-1(n2/n1) = sin^-1(1/2) = 30 degree. |
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