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A ray of light traveling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of $45^{\circ}$ The ray undergoes total internal reflection . If n is the refractive index of medium with respect to air, select the possible value of n from following

$(a)\;1.3 \\ (b)\;1.4 \\ (c)\;1.5 \\ (d)\;1.6 $

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