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凸透镜焦距的确定及探究凸透镜成像规律的实验是学习凸透镜知识时应全面把握好的问题,实验时如何测量凸透镜的焦距呢,常用方法有两种,下面结合中考实例加以说明.一、利用凸透镜汇聚平行光例1(2013年山东省日照市)如图1所示,一束平行光经过一凸透镜,调节光屏的位置直到在屏上得到一个最小、最亮的光斑.小明用此凸透镜做
Convex lens focal length to determine and explore the lens imaging of the law is to learn the knowledge of convex lens should be a comprehensive grasp of the problem, the experiment how to measure the focal length of the convex lens, there are two commonly used methods, the following combination of test examples to illustrate one, the use of convex lens convergence Parallel Light Example 1 (Rizhao City, Shandong Province, 2013) As shown in Figure 1, a bundle of parallel light passes through a convex lens to adjust the position of the light screen until a minimum and brightest spot on the screen is obtained.