22. I Fig. 4.66, a ray of light PQ is
incident normally the
hypotenuse of an isoceles right
angled prism ABC. (a) Complete
the path of the ray PQ till it
+
emerges from the prism. Mark in
the diagram the angle wherever
necessary. (b) What is the angle of deviation of the
ray PQ ? (c) Name a device in which this action is used
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