Home Physics Wave Optics Polarisation of Light A transparent thin plate of Polaroid is plac…
Physics Wave Optics Polarisation of Light MCQ (Single Correct)

A transparent thin plate of Polaroid is placed on another similar plate such that the angle between their axes is 30 0 . The intensities of the emergent and the unpolarized incident light will be in the ratio of :

A
1:4
B
1:3
C
3:4
D
3:8

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The correct answer is:
D

Let be the intensity of unpolarized light, then intensity of light from first transparent thin plate of a Polaroid is

Now, this light will pass through the second similar plate whose axis is inclined at an angle of to that of first plate.

According to Malus law, the intensity of emerging light is

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