在初中与高中物理教学中演示物体微小形变的实验,通常都用较长较细的木条或铁条,在其中央加一砝码,物体出现弯曲形变.这固然也能说明问题,但对于较厚,较坚硬,较短的物体的弯曲形变,就很难演示.我们改用氦氖激光器和小平面镜作该实验,收到较好效果.装置如下图; In the experiment of demonstrating the small deformation of objects in the physics teaching of junior high school and high school, usually long and thin wooden strips or iron strips are used, and a weight is added at the center of the object, and the object is bent and deformed. This certainly can explain the problem, but for Thicker, harder, shorter bending deformation of the object, it is difficult to demonstrate. We use helium-neon laser and small plane mirror for the experiment, received better results. Device as shown below;