A ray of light falls on one of the lateral surface of an equilateral glass prism placed on thehorizontal surface of a table.For minimum deviation of ray, which ofthe following is true? [ ]a) PQ is horizontalb) QR is horizontalc) RS is horizontald) either PQ or RS is horizontal

A ray of light falls on one of the lateral surface of an equilateral g

1.	A ray of light falls on one of the lateral surface of an equilateral glass prism placed on thehorizontal surface of a table.For minimum deviation of ray, which ofthe following is true? [ ]a) PQ is horizontalb) QR is horizontalc) RS is horizontald) either PQ or RS is horizontal
Answer» Option (b) QR is horizontalExplanation: In ORDER to have a minimum deviation, the REFRACTED ray INSIDE the PRISM should be parallel to the base of the prism. Therefore QR should be parallel to the base of the prism. Since the base of the prism is horizontal, QR should be horizontal. Therefore, the correct option is option (b).Hope this HELPS.

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A ray of light falls on one of the lateral surface of an equilateral glass prism placed on thehorizontal surface of a table.For minimum deviation of ray, which ofthe following is true? [ ]a) PQ is horizontalb) QR is horizontalc) RS is horizontald) either PQ or RS is horizontal

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