A ray of light travelling in a transparent medium of refractive index μ falls, on a surface separating the medium from the air at an angle of incidence of 45^o. For which of the following value of μ the ray can undergo total internal reflection?

μ =1.33

μ = 1.40

μ = 1.50

μ = 1.25

Answer

μ = 1.50

For total internal reflection
i > c
⇒ sin i > sin c
⇒ sin 45^o > 1/ μ
μ > 2^1/2
μ > 1.4

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