A beam of unpolarised light of intensity `I_0` is passed through a polaroidA and then
Channel: Doubtnut
Date: 2020-07-05

A beam of unpolarised light of intensity `I_0` is passed through a polaroidA and then through another polaroid B which is oriented so that its principal plane makes an angle of `45^circ` relative to that of A. The intensity of the emergent light is