Question 63: Waves Optics

Question

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

Accepted Answer

If I is the intensity of the incident light then R + T = I. Since the incident ray is travelling in a denser medium (glass), it will be totally reflected at a certain critical angle $$	heta$$
c
. For $$	heta$$  $$	heta$$
c
, there is no refracted ray. Hence for $$	heta$$ > $$	heta$$
c
, the value of R is 100%. Hence the only correct option is (c).

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Answer

Waves Optics

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

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