透镜有凸、有凹;成像可无可有;可能成正立虚像,也可能成倒立实像;可能放大,可能缩小地可能是物像大小相等。在教学过程中,讲得粗了,缺乏对比,不够鲜明;讲得细了,多次重复,难免烦琐。想要做到详略适宜、恰到好处,掌握分寸,确实不易。运用现代化的教学手段——电脑,通过人机对话的方式,进行已知焦距F,物距U和物高HU,求像距V和像高HV的计算,再选定适当比例,将入射线、折射线以及必要的延长线,用高分辨率图形(HGR)模拟出来,显示各种不同的作图成像过程。这样教学,有助于学生系统掌握透镜成像规律的基本知识,有助于培养学生分析、解决问题的能力,从而发展智力。我们用 The lens is convex and concave; image formation is irrelevant; it may be an erect virtual image, or it may be an inverted real image; it may be enlarged, and the image may be reduced in size. In the teaching process, it is rough, lacks contrast, and is not clear enough; when it is elaborated and repeated, it will inevitably be cumbersome. If you want to be more detailed and appropriate, it is not easy to master your sense of proportion. Using a modern teaching method—computer, through a human-machine dialogue, the known focal length F, the object distance U, and the object height HU are calculated, the image distance V and the image height HV are calculated, and an appropriate ratio is selected to insert the rays. The refraction lines and the necessary extension lines were simulated using high-resolution graphics (HGR) to show various imaging processes. Such teaching will help students master the basic knowledge of the lens imaging law, help students develop the ability to analyze and solve problems, and thus develop intelligence. we use