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实验说明,凸透镜对光线有会聚作用,凹透镜对光线有发散作用,它们对光线的作用遵循折射定律．透镜对光线的作用常用三条特殊光线来表示,这三条特殊光线分别是：(1)平行于主光轴的光线；(2)经过透镜的中心(光心)的光线；(3)经过透镜焦点的光线(或光线的延长线经过焦点)．这三条特殊光线经过透镜作用后的结果也
The experiment shows that the convex lens has a converging effect on the light, and the concave lens has a divergent effect on the light. Their effect on the light follows the law of refraction. The effect of the lens on the light is usually expressed by three special light rays: (1) rays parallel to the main optical axis; (2) rays passing through the center of the lens (optical center); (3) passing through the lens focus The light (or the extension of the light passes through the focus). The result of these three special lights after the lens