现在绝大多数初中物理教材中关于透镜的描述都这样提到:“凸透镜对光线起会聚作用,凹透镜对光线起发散作用.”但如果细加推敲便会发现,此结论并不十分准确,有其局限性.如果条件适当,凸透镜也可以对光线起发散作用,凹透镜则可以对光线起会聚作用.下面我们就来具体分析.由于我们 Now most of the junior high school physics textbooks describe the lens as follows: “The convex lens converges on the light, and the concave lens makes a divergent effect on the light.” But if you refine it, you will find that this conclusion is not very accurate. Its limitations. If the conditions are appropriate, the convex lens can also diverge the light, and the concave lens can converge on the light. Here we come to the specific analysis. Because we