有这样两条判断题：（1）经凸透镜折射后的光线一定是会聚光线．（2）凸透镜对任何光线都有会聚作用．常常有同学拿着这两条题目来问老师．这两道题同学们难以判定的原因是对“会聚光线”与“会聚作用”这两个概念的含义不明确造成的，因此下面就来谈谈这两个概念的含义．物理 There are two judgment questions: (1) The light refracted by the convex lens must be convergent. (2) The convex lens has convergence effect on any light. There are often classmates who are holding these two topics to ask the teacher. The reason why these two questions are difficult for students to determine is that the meanings of the two concepts of “convergence light” and “convergence” are not clear, so here’s the meaning of these two concepts. physical