Sheet of polaroid?

A clear sheet of polaroid is placed on top of a similar sheet so that
their polarizing axes make an
angle of 30◦ with each other. The ratio of the intensity of emerging
light to incident unpolarized
light is:
A. 1 : 4
B. 1 : 3
C. 1 : 2
D. 3 : 4
E. 3 : 8
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