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人教版第三册(必加选)第二十章第四节“光的偏振”一节中光的偏振实验,笔者用 Flash 课件演示:当两个偏振片 P 和 Q 的透振方向平行时,透射光的强度最大.然后,保持偏振片 P 的透振方向不变,使偏振片 Q 绕光的传播方向为轴慢慢转动,使 Q 的透振方向与 P 的透振方向间的夹角由0°逐渐变大,可以看到透射光的强度也不断变化:先由亮逐渐变暗,再由暗逐渐变亮.旋转一周将出现两次最亮和两次最暗.
The third edition of the PEP (must be added) is the polarization experiment of the light in the section “The Polarization of Light” in Chapter 40 of the 20th chapter. The author uses the Flash courseware to demonstrate: When the two polarizers P and Q When the directions are parallel, the intensity of the transmitted light is the largest. Then, keep the polarization direction of the polarizer P constant, and make the polarizer Q slowly rotate around the light propagation direction, so that the direction of the Q vibration and the direction of the P vibration The angle between the two gradually increases from 0°, and the intensity of the transmitted light also changes continuously: it gradually becomes darker from light, and then gradually becomes darker. The rotation will occur twice in the brightest and twice in the darkest.