Question

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 ?

• A. PQ is horizontal
• B. QR is horizontal
• C. RS is horizontal
• D. Either PQ or RS is horizontal

Answer 1

Answer: (B)

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).