A ray of light falls on one of the lateral surfaces of an equilateral glass prism placed on the horizontal surface of a table as shown in figure. For minimum deviation of ray, 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:B
A ray of light falls on one of the lateral surfaces of an equilateral glass prism placed on the horizontal surface of a table as shown in figure. For minimum deviation of ray, 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