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

(a) μ=1.33                             (b) μ=1.40

(c) μ=1.50                             (d) μ=1.25

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