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Question

For an angle of incidence of 450 at the top surface of a glass slab as shown in the figure, What is the maximum refractive index of glass for total internal reflection to take place? [For water μ=43]


A
432
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B
423
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C
342
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D
324
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Solution

The correct option is B 423
Conditions for TIR
1. Light should be travelling from a denser to a rarer medium.
2. Angle of incidence should be greater than the critical angle.

By applying Snell's law
n1Sini=n2Sinr
nSin450=43×Sin900
n×12=43×1
n=423

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