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Write the mathematical expression for Malus law. Explain the terms. 

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I = I0 cos2 θ, Where I is the intensity of the emergent light from second polaroid (analyser), I0 is the intensity of plane polarised light incident on second polaroid after passing through first polaroid (polariser) and θ is the angle between the pass-axes of two polaroids (analyser and polariser). 

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