A beam of light `AO` is incident on a glass slab `(mu=1.54)` in a direction as shown in figure. The reflected ray `OB` is passed throught a Nicol prism. On viewinf through a Nicole prism, we find rotating the prism that `(tan^(-1)1.54=57^(@))`

Options

A. (a) The intensity is reduced down to zero and remains zero
B. (b) The intensity reduces down somewhat and rises again
C. (c) There is no change in intensity
D. (d) The intensity gradually reduces to zero and then again increases

Answer

D

Explanation

In the arrangement shown, the unpolarised light is incident at polarising angle of `90^@-33^@=57^@`. The reflected light is thus plane polarised light. When plane polarised light is passed through Nicol prism (a polariser or analyser), the intensity gradually reduces to zero and finally increases.