A ray of light PQ is incident normally on the hypotenuse of a right angled prism ABC as shown in the diagram given alongside:
(i) Copy the diagram and complete the path of the ray PQ till it emerges from the
prism.
(ii) What is the value of the angle of deviation of the ray?
(iii) Name an instrument where this action of the prism is used.

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Solution

(i) The required diagram is shown in the given figure with ray PQ emerging out of the prism.
(ii) Angle of deviation is the angle between incident ray and the refracted ray, so here angle of deviation $(δ) = 180^{o}$
(iii) This phenomenon of turning the light ray by $180^{0}$ is used in prism binoculars for $180^{0}$ coverage range in vision.

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