Question

A beam of light $AO$ is incidents on a glass slab $(\mu =1.54)$ in a direction as shown, in the Fig . The reflected ray $OB$ is passed through a Nicol prism. On rotating the Nicol prism we observe the

• A. the intensity is reduced to zero and remains zero.
• B. the intensity reduces somewhat and rise again.
• C. there is no change in intensity.
• D. the intensity is gradually to reduces to zero and then again it increases.

Answer 1

The correct option is D the intensity is gradually to reduces to zero and then again it increases.

$i_p=90-33={57}^o$
Thus the reflected light is plane polarized as per the Brewster's law ($\mu =tan{i}_p$) is satisfied. On examining this light by rotating Nicol prism the intensity variation with zero min is observed.