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

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a

$2 a^{2}$

b

$a^{2}$

c

$\sqrt{2} a^{2}$

d

$\frac{a^{2}}{\sqrt{2}}$

answer is B.

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Detailed Solution

Intensity of light transmitted by polariser is half of intensity of unpolarized light.

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