n.偏光器；起偏鏡
The orientation of the principal stresses relative to the directions of the polarizer and first quarter-wave plate is of course immaterial. 主應(yīng)力相對(duì)于起偏鏡和第一個(gè)四分之波片方向的方位，當(dāng)然是無(wú)關(guān)緊要的。
去極劑； 退極化劑
