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  4. Two polaroids have their polarizing directions parallel so that the intensity of a transmitted light is maximum. The angle through which either Polaroid must be turned if the intensity is to drop by one-half is

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Q. Two polaroids have their polarizing directions parallel so that the intensity of a transmitted light is maximum. The angle through which either Polaroid must be turned if the intensity is to drop by one-half is

AIEEEAIEEE 2012Wave Optics

Solution:

For $I= \frac{I_{0}}{2} and I=I_{0}\,cos^{2} \,\theta=\frac{I_{0}}{2}$
$\therefore \theta=45^{°}$
Therefore the angle through which either polaroids turned is $135^° (= 180^° -45^°)$