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  4. A polaroid is being used as an analyzer of plane polaroid light. In one complete rotation of the crystal, the maximum intensities will be observed only

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Q. A polaroid is being used as an analyzer of plane polaroid light. In one complete rotation of the crystal, the maximum intensities will be observed only

Wave Optics

Solution:

$I=I_{0} \cos ^{2} \theta$
If $I=I_{0} \Rightarrow \cos ^{2} \theta=1$
or $\cos \theta=\pm 1 \Rightarrow \theta=0^{\circ}, 180^{\circ}$
Hence maximum intensity is observed twice.