我们知道透镜分两种,凸透镜对光线起会聚作用,又叫会聚透镜.凹透镜对光线起发散作用,又叫发散透镜.若给你如图1所示的一条入射光线和它的折射光线,让你填上合适的透镜(不能改变光线的位置),你该怎样解决这个问题呢?许多同学对如何解决这个问题不得要领,不知道应在什么位置画什么样的透镜,结果试来试去白白浪费了不少时间. We know that there are two kinds of lens. Convex lens converges on the light. It is also called the converging lens. The concave lens makes a divergent effect on the light. It is also called a divergent lens. If you give an incident light and its refracted light as shown in Figure 1, let You fill in a suitable lens (can not change the position of the light), how do you solve this problem? Many students have no idea how to solve this problem, do not know what kind of lens should be painted, the results try to go to Wasted a lot of time.