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The axes of the polariser and analyser a...

The axes of the polariser and analyser are inclined to each other at `45^@`. If the amplitude of the unpolarised light incident on the polariser is `a`, then the amplitude of the light transmitted through the analyser is

A

`a/2`

B

`a/sqrt2`

C

`sqrt3/2 a`

D

`3/4 a`.

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