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Two polaroids are oriented with their pl...

Two polaroids are oriented with their planes perpendicular to incident light and transmission axis making an angle of `30^(@)` with each other. What fraction of incident unpolarised light transmitted?

Text Solution

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Suppose intensity of unpolarised light `I'`
:. Intensity of polarised light `=(I')/2`
Intensity of emergent light
`I=(I')/2 cos^(2) 30^(@)`
`=(I')/2xx3/4=(3I')/8`
:. Fraction of incident unpolarised light of transmitted
`I/(I')=3/8`
`rArrI/(I')=300/8=37.5%`
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