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初中物理课本第二册第22页“凸透镜的应用”中介绍了照相机和幻灯机.目前农村大部分中学(特别是山区和联办初中)还没有照相机和幻灯机,即使有幻灯机,上课时遇到停电也无法演示。几年来,我利用自制的照相机和幻灯机的模型,通过演示使同学们能在几分钟时间内就掌握了照相机和幻灯机的原理。并有部分学生课后自己利用废灯泡灌满清水或玩具放大镜片代替凸透镜,制成照相机和幻灯机,丰富了第二课堂。现将
The camera and slide projector were introduced in the second volume of the junior high school physics textbook booklet, page 22, “Application of Convex Lenses.” At present, most secondary schools in rural areas (especially in mountain areas and junior high schools) do not have cameras and slide projectors, even if they have slide projectors, Power outages cannot be demonstrated. Over the past few years, I have used home-made models of cameras and slide projectors to demonstrate that students have mastered the principles of cameras and slide projectors within minutes. Some students also made use of waste light bulbs to fill in clear water or toy magnifying glass instead of convex lenses after class to make cameras and slide projectors, enriching the second classroom. Now