题目1单选题
一束光强为I0的自然光,相继通过三个偏振片P1、P2、P3后,出射光的光强为I=I0 /8.已知P1和P3的偏振化方向相互垂直,若以入射光线为轴,旋转P2,要使出射光的光强为零,P2最少要转过的角度是A. <img src="https://tihai-oss-cloud.itihey.com/img/f61fa92d5ede6557f1ece7690ef201cd.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/7a38e27c699f502dda8d84c619dba24a.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/05be3f92553d690a5b8c1979e1d91329.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/3bcffdc34b16f0f3294843e82a7647aa.png">