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Unpolarised light is passed through a polarised $$P_1$$. When this polarised beam passes through another polarised $$P_2$$ 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 $$2\pi$$.


Solution

Here,
  1.  $$E$$ is unpolarized light passes through a polarizer $$P_1$$ and again this polarized light pass through a polarizer $$P_2$$, the pass axis of $$P_2$$ makes angle $$\theta$$ with the pass axis of $$P_1$$, 
  2. Expression for the polarised beam passing through the $$P_2$$ is $$I=I_ocos^2\theta ,$$Here $$I=$$Intensity of unpolarised light, $$I_o=$$Intensity of polarised light, and $$\theta$$ is the angle between Polarizer $$P_1$$ and $$P_2$$. This is known as malus' law. 

657547_623031_ans_6c5a3f68cd7d4d2bb2f4f7f480267a0d.png

Physics

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