57. Unpolarized light of the intensity I0 passes through two polaroids. The axis of the first polaroid is vertical. The second polariod is at 30° to the vertical. Find the intensity of the transmitted light.
(A) (3/4)I0
(B) (3/8)I0
(C) (1/4)10
(D) (1/8)I0
(E) (1/2)I0
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統計: A(1), B(2), C(0), D(0), E(0) #3421252
統計: A(1), B(2), C(0), D(0), E(0) #3421252