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根据折射光线和人射光线的方向来判别所用透镜是凸透镜还是凹透镜，对同学们来说，是一个比较难的问题．有的同学往往认为：甲图中所用的透镜是凸透镜，乙图中所用透镜是凹透镜．而正确答案正好相反．那么到底该怎样判别呢？现在向大家介绍一种简单的判断方法：假设将人射光线?
According to the direction of the refracted ray and the ray of the person, it is difficult for the students to determine whether the lens used is a convex lens or a concave lens. Some classmates often think that the lens used in Figure A is a convex lens, and the lens used in Figure B is a concave lens. The correct answer is exactly the opposite. So in the end how to determine it? Now let us introduce a simple way to judge: Assume people shoot light?