Question: Q. 2. Unpolarised light is passed through a polaroid $P_{1}$. When this polarised beam passes through another polaroid $P_{2}$ and if the pass axis of $P_{2}$ makes angle $\theta$ with the pass axis of $P_{1}$, then write the expression for the polarised beam passing through $P_{2}$. Draw a plot showing the variation of intensity when $\theta$ varies from 0 to $2 \pi$.
U] [OD 2017]
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Solution:
Ans. Intensity is $\frac{I_{0}}{2} \cos ^{2} \theta$ (if $I_{0}$ is the intensity of unpolarised light.) (Award $1 / 2$ mark if the student writes the expression as $I_{0} \cos ^{2} \theta$ )
[CBSE Marking Scheme 2017]
