What can you say about the value of the angle of deviation in such a situation?

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Solution

The diagram is shown for a ray of light incident at an angle of incidence ' $i$ ' passes through an equilateral glass prism such that refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ' $e$ '. Here, in this case, $a n g l e o f i n c i d e n t ∠ i = a n g l e o f e m e r g e n c e ∠ e$ . In such cases, the angle of deviation for the ray which is incident on the surface of a glass prism, the emergent ray will be having minimum angle of deviation compared to other situations where the refracted ray does not pass parallel to the base of the prism.

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