摘要
介绍了利用激光器及改装的螺旋测微计在课堂上演示障碍边缘衍射，反射衍射、单缝衍射和散斑现象的方法及取得的教学效果．
Some methods demonstrating the diffraction from the edge of an obstacle, in the reflected light, and from a single slit, together with the speckle phenom ena, in the classroom with a laser and a modified screw micrometer are introduced as well as the results of demonstration.
