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For total internal reflection to occur, which condition must be satisfied?

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For total internal reflection to occur, which condition must be satisfied?

(a) N1 = N2

(b) N1 > N2

(c) N1 < N2

(d) N1 x N2=1

This question was posed to me in exam.

This interesting question is from Refractive Index and Numerical Aperture topic in chapter EM Wave Propagation of Electromagnetic Theory

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The correct option is (b) N1 > N2

For explanation: The refractive of the transmitting medium should be greater than that of the receiving medium. In other words, the light must flow from denser to rarer medium, for total internal reflection to occur.

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