Question

4) A ray of light falls on one of the lateral surface of an equilateral glass
prism placed on the horizontal surface of a table as shown in fig.
2 For minimum deviation of ray, which of the following is true?
A) PQ is horizontal
C) RS is horizontal
B) QR is horizontal
D) either PQ or RS is horizontal
vision what​

Answer 1

Answer:

Explanation:

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