First slide

Polarisation

Question

A beam of light AO is incident on a glass slab $(μ = 1 .54)$ in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that

Moderate

A

The intensity is reduced down to zero and remains zero
B

The intensity reduces down somewhat and rises again
C

There is no change in intensity
D

The intensity gradually reduces to zero and then again increases

Solution

In the arrangement shown, the unpolarised light is incident at polarising angle of $90^{\circ} - 33^{\circ} = 57^{\circ} .$ 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.

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