Question

Draw the path of light ray when it passed through the prism with the angles of deviation. Write the expression of angles of deviation.​

Answer 1

Let a ray of monochromatic light OP incidents at P on the retracting face AB at an angle of incidence $i_{1}$ and suffers refraction from air to glass to glass, bends towards the normal making an angle of refraction equal to $r_{1}$ and finally travels along the path PQ inside the prism . Again the refracted ray PQ strikes the retracting surface AC of the prism at an angle of incidence $r_{2}$ and after suffering refraction from glass to air, it energes out of the prism at an angle of emergence $i_{2}$

Here, the angle between the direction of incident ray and the emergent ray (∠LMQ) is called angle of deviation  of the ray of light after refraction through the prism.

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