A student has drawn the following course...

A student has drawn the following courses of rays through a glass prism, Fig. Which one represents the position of minimum deviation ?

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Choice (d) in Fig. shows the correct course of rays through prism in minimum deviation position. This is because in this position, the refracted ray is parallel to the base of the prism and incident ray and emergent ray are inclined equally to the two faces of the prism.

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