A light beam is incident on a rectangular glass plate `(mu= 1.54)` The reflected light OB passes through a nicol prism.
On observing the transmitted light while rotating the prism, it is seen that

Options

A. intensity of light reduces to zero
B. intensity of light decreases and then increases
C. there is no change of intensity of light
D. intensity of light reduces to zero slowly and then starts to increase

Answer

B

Explanation

The relected light is partially rotatas, ` theta` changes. Hence, intensity will show the variation proportional to ` cos^(2) theta`
` i.e l = l_(0) cos^(2) theta`
When angle increases ` cos^(2) theta`
decreases and vice - versa .