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  4. A ray of light is incident on an equilateral glass prism placed on a horizontal table. For minimum deviation which of the following is true ?

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Q. A ray of light is incident on an equilateral glass prism placed on a horizontal table. For minimum deviation which of the following is true ?Physics Question Image

IIT JEEIIT JEE 2004

Solution:

During minimum deviation the ray inside the prism is parallel
to the base of the prism in case of an equilateral prism.
Hence, the correct option is (b).