Q. 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 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
Explanation

(d) In the arrangement shown, the unpolarised light is incident at polarizing angle of $90{^\circ} - 33{^\circ} = 57{^\circ}$. The reflected light is thus plane polarized light. When plane polarized light is passed through Nicol prism (a polarizer or analyser), the intensity gradually reduces to zero and finally increases

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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