Whenever an unpolarized light passes through a polarizer, its intensity reduces by a factor of 1/2.
It is also important to note that the transmitted light is polarized along the axis of the polarizer.
The transmitted intensity of a polarized light of intensity I0 incident on a polarizer is:
Unpolarized light of intensity I0 is incident on three polarizing filters. The axis of the first is vertical, that of the second is 30° from vertical, and that of the third is horizontal. What light intensity emerges from the third filter?
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