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प्रश्न
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.
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उत्तर
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:
संबंधित प्रश्न
Three identical polaroid sheets P1, P2 and P3 are oriented so that the pass axis of P2 and P3 are inclined at angles of 60° and 90° respectively with the pass axis of P1. A monochromatic source S of unpolarised light of intensity I0 is kept in front of the polaroid sheet P1 as shown in the figure. Determine the intensities of light as observed by the observer at O, when polaroid P3 is rotated with respect to P2 at angles θ = 30° and 60°.
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