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

Options

A. `I_0//4`
B. `I_0//8`
C. `I_0`
D. `I_0//2`

Answer

A