PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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Unpolarised light is passed through a polaroid P1. When this polarised beam passes through another polaroid P2 and if the pass axis of P2 makes angle θ with the pass axis of P1 - PUC Karnataka Science Class 12 - Physics

Question

Unpolarised light is passed through a polaroid P1. When this polarised beam passes through another polaroid P2 and if the pass axis of P2 makes angle θ with the pass axis of P1, then write the expression for the polarised beam passing through P2. Draw a plot showing the variation of intensity when θ varies from 0 to 2π.

Solution

When unpolarised light passes through the polariser P1 the intensity drops to half that is I_o/2 and when this polarised light passes through the polariser P2 the instensity of the emitted light is

I=I_0/2cos^2 theta

(θ is the angle between polariser P1 and P2)

The instensity distrubution is as shown below:

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Solution Unpolarised light is passed through a polaroid P1. When this polarised beam passes through another polaroid P2 and if the pass axis of P2 makes angle θ with the pass axis of P1 Concept: Polarisation.
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