SATHEE: wave-optics Question 36

Wave Optics

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wave-optics Question 36

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 $θ$ 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 $θ$ varies from 0 to $2 π$ .

U] [OD 2017]

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Solution:

Ans. Intensity is $\frac{I_{0}}{2} \cos^{2} θ$ (if $I_{0}$ is the intensity of unpolarised light.) (Award $1 / 2$ mark if the student writes the expression as $I_{0} \cos^{2} θ$ )