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State and obtain Malus' law....

State and obtain Malus' law.

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When a beam of plane polarised light of intensity `I_(o)` is incident on an analyser, the light transmitted of intensity I from the analyser varies directly as the square of the cosine of the angle `theta` between the transmission axis of polariser and analyser. This is know as Malus.s law.
`I=I_(o) cos^(2) theta`
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