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An unpolarised light of intensity 32W//...

An unpolarised light of intensity `32W//m^(2)` passes through three polarisers, such that the transmission axis of last polarizer is perpendicular with that of the first. If the intensity of emergent light is `3W//m^(2)` then the angle between the transmission axes of the first two polarisers is `pi/n` radian, where n is____.

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