初中物理“透镜”一节的教学,通常用演示实验的方法来得出凸透镜的成象规。但由于有一部分学生看不见光屏上所成的象、更看不到光具座上刻度尺的刻度而搞不清物距、象距,再接触不等式的应用又是学生比较生疏的,因此凸透镜成象规律成了教学上的难点。为此我采用了边教边实验的方法,让学生在动手做实验的过程中理解概念,认清所成象的特点,掌握成象的规律。我的教学设计如下。 Teaching in the “lens” section of junior high school physics usually uses demonstration experiments to derive the convex lens’ imaging rules. However, because some students cannot see the images on the screen or see the scale of the scale on the optical bench, they cannot figure out the object distance and the image distance. The application of re-contact inequality is also unfamiliar to students. Convex lens imaging has become a difficult teaching. For this reason, I used a side-by-side teaching method to allow students to understand the concepts in the hands-on experimentation process, recognize the characteristics of the images, and master the laws of imaging. My teaching design is as follows.