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Intensity of Polarised Light

An unpolarise...

Question

An unpolarised beam of intensity 2a² passes through a thin polaroid. Assuming zero absorption in the polaroid, the intensity of emergent plane polarised light will be

a²

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2a²

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√2 a²

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a²/ √2

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Solution

The correct option is A
a²

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A polaroid is placed at 45^o to an incoming light of intensity I₀. Now the intensity of light passing through polaroid after polarisation would be

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