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

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

Options

G1 Physics · Accepted Answer

Step 1: A ray in medium μ meeting air at i = 45° undergoes total internal reflection if i > C where sin C = 1/μ. Step 2: Condition becomes μ > 1/sin45° = √2 ≈ 1.414. Step 3: Only listed μ = 1.50 satisfies μ > 1.414. Final answer: (C) 1.50.