Question

A light ray travelling in a glass medium is incident on a glass-air interface at an angle of incidence of θ. The reflected (R) and transmitted (T) intensities, both as functions of θ, are plotted. The correct sketch is:

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Answer 1

Explanation:

At normal incidence (θ = 0°), some light is indeed reflected (R > 0) and the rest is transmitted (T < 100%).

As θ increases toward the critical angle θ_c, transmitted intensity T decreases and reflected intensity R increases.

At θ = θ_c, total internal reflection occurs with T = 0 and R = 100%.