An unpolarized light beam with intensity I0 is first passed through an ideal polarizer. At this instant, the light is polarized. We then pass that light through 3 more identical polarizers having parallel axes of transmission to each other. If the transmission axis of the final polarizer makes an angle of 45 ∘∘ with the electric field direction of the polarized light, what is the intensity of the emerging light?

The intensity of the emerging light reduced to 25%

Explanation:

Given :

Unpolarized light intensity =

Initial polarizer angle = 0°

Final polarizer angle between optic axis and transmission axis = 45°

Unpolarized light passes through first polarizer the intensity reduces to half.

after second polarizer the intensity is half till the last polarizer,

Therefore, the intensity of the emerging light reduced to 25%

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