Question
A partially plane polarised beam of light is passed through a Polaroid. Show graphically the variation of the transmitted light intensity with angle of rotation of the Polaroid.
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Answer
The partially polarised beam consists of unpolarised plus polarised light. The intensity of unpolarised part varies according to. $\text{I}_\text{p}=\text{(I}_0)_\text{p}\cos^2\theta$ $\therefore\text{I}=\text{(I}_0)_\text{un}+\text{(I}_0)_\text{p}\cos^2\theta$ The graph from $\theta=0\text{ to }\theta=2\pi$ (full rotation) is shown in fig.
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