Question

A given ray of light suffers minimum deviation in an equilateral prism P. Additional prism Q and R of identical shape and of the same material as P are now added as shown in the figure. The ray will now suffer ______.

Options

• greater deviation

• no deviation

• same deviation as before

• total internal reflection

Answer 1

A given ray of light suffers minimum deviation in an equilateral prism P. Additional prism Q and R of identical shape and of the same material as P are now added as shown in the figure. The ray will now suffer same deviation as before.

Explanation:

There will be no refraction from P to Q and then from Q to R (all being identical). As a result, the ray now has the same deviation.