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Minimum Deviation

An object is ...

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An object is placed in front of a right angled prism ABC in two positions (a) and (b) as shown. The prism is made of crown glass with critical angle $41^{0}$ Trace the path of rays starting from P and Q as shown in the figures (a) and (b) entering normal to the prism.

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An object placed in front of right angled prism ABC in two position.

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