A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes and angle of 450 relative to that of A. The intensity of the emergent light is :
I0 / 8
I0
I0 / 2
I0 / 4
When the beam of unpolarized light passed through a polaroid A, then its intensity becomes
When this again passed through a polaroid B, oriented at relative to A then,