12. a quarter-wave plate is placed in between a polarizer and a photo-detector. when the optic axis of the quarter- wave plate is kept initially parallel to the

12. A quarter-wave plate is placed in between a polarizer and a photo-detector. When the optic axis of the quarter- wave plate is kept initially parallel to the pass axis of the polarizer and perpendicular to the direction of light propagation. The intensity of light passing through the quarter-wave plate is measured to be 1, (see figure). If the quarter wave plate is now rotated by 45° about an axis parallel to the light propagation, what would be the intensity of the emergent light measured by the photo- detector? Ans Direction of rotation of quarter wave plate Polaroid Quarter wave platehoto-detector (a)- 2 (d) LIAM PH-20101