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An unpolarised light of intensity 64 Wm^...

An unpolarised light of intensity 64 Wm^(-2) passes through three polarisers such that the transmission axis of the last polariser is normal to first. If the intensity of emerging light is 6 Wm(-2),then angle between first two polariser may be

A

`30°`

B

`45°`

C

`37°`

D

`57°`

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