Unpolarised light of internsity 32 Wm^(-...

Unpolarised light of internsity `32 Wm^(-2)` passes through three polarisers such that the transmission axis of the last polariser is crossed with the first. If the intensity of emerging light is 2` Wm^(-2)`, the angle between the transmission axes o the first two polarisers is

`22.5^@`

`32.5^@`

`42.5^@`

`62.5^@`

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