Home Physics Wave Optics Polarisation of Light A beam of light AO is incident on a glass sl…
Physics Wave Optics Polarisation of Light MCQ (Single Correct)

A beam of light AO is incident on a glass slab 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

A
The intensity is reduced down to zero and remains zero
B
The intensity reduces down some what and rises again
C
There is no change in intensity
D
The intensity gradually reduces to zero and then again increases

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The correct answer is:
D

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.

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