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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 he ray can undergo total internal reflection?
(a) m = 1.33 (b) m = 1.40 (c) m = 1.50 (d) m = 1.25

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the value of μ will be 

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