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凸透镜成像问题是光学部分的重点,也是难点,同时也是各地中招考试命题的热点.分析近几年的中考试题,命题点多集中在凸透镜成像实验的探究、凸透镜成像基本规律等,现结合几例进行分析.注重对实验过程的考查凸透镜成像规律的探究是掌握成像规律、突破难点的钥匙,一定要重视探究,经历探究过程.例1小刚和两位同学一组,用蜡烛、凸透镜和光屏在光具座上探究凸透镜成像规律.
Convex lens imaging problem is the focus of the optical part, but also difficult, but also around the examination of the proposition hot topic.Analysis of the examination questions in recent years, the proposition point focused on the imaging of convex lens to explore the basic laws of convex lens imaging, is the combination of a few Cases of analysis. Pay attention to the test of the process of research imaging convex lens imaging law is to grasp the imaging rules, the key to break through the difficulties, we must pay attention to explore, through the process of inquiry.Example 1 Xiaogang and two classmates, with candles, convex lens and light Screen in the optical bench to explore convex lens imaging.