[单选题]
When the transmission axes ofxfhhgzv ua:9 5hrz :8/ two Polaroid films arefc 3fflzgc++vly y8ien7:j:)i u-j 6x perpendicular to each other, what is the percentage of the i8ugi-ec c:+)nv76f3fl:zy j lyji +xfncident light which will pass the two films?
