試題詳解

57. There is an ideal polarizer with the angle of ϕ = 60° between the polarizing axis and the vertical axis, and there is an ideal analyzer with the angle of ϕ = 0° between the polarizing axis and the vertical axis.When an unpolarized light with intensity I is incident on this ideal polarizer, what is its transmitted intensity?
(A) 0.125 I
(B) 0.250 I
(C) 0.750 I
(D) 0.866 I
(E) 1.000 I