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人教版八年级物理上册第五章第一节“光的直线传播”的“想想做做”栏目中有一个体会小孔成像的动手活动,教材提供的方法虽然简便,但屏幕暴露在外,成像不太清楚。笔者对其做了改进,即改用两个纸筒,不但使像呈现在暗室,而且成像清晰,能改变像距。另外,通过更换“镜头”、屏幕,更能演示第五章第二节“生活中的透镜”中的照相机和第五节“显微镜和望远镜”中的望远镜、显微镜的成像原理,具有废物利用、操作简便、一物多用的优点。
People’s Education Publishing House eighth grade physics on the first chapter fifth chapter “light linear transmission ” “Think about what to do ” column there is a little hole imaging experience hands-on activities, teaching materials provided method is simple, but Screen exposure, imaging is not clear. I made improvements, that is, the switch to two paper drums, not only to make the image appear in the darkroom, and the imaging is clear, can change the image distance. In addition, through the replacement of the “lens”, the screen, but also better demonstrate Chapter 5, Section 2 “life in the lens ” camera and the fifth section “microscope and telescope ” telescope, microscope imaging Principle, with waste utilization, easy to operate, a multi-purpose advantages.