The following diagram shows a 60°,30°,90° glass prism of critical angle 42°.Copy the diagram and complete the path of incident ray AB emerging out of the prism marking the angle of incidence on each surface
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Critical angle of the prism is 42
o
.
The ray AB is incident on the face XY at an incidence angle 30
o
which is smaller than critical angle of prism. So, the ray refracts at the face XY and emerges away from normal N as shown in the figure.
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