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法线是几何光学中的一个很重要的概念，是人们研究光现象的有关规律而引入的几何辅助线，实际上并不存在故用虚线画出．它在光学问题的研究中有着很重要的作用．一、法线是理解光路图的基础有的同学对课本中的几幅图感到不好理解，究其原因就在于这些光路图中少画了法线．如在?
The normal line is a very important concept in geometric optics. It is a geometric auxiliary line introduced by people to study the laws of light phenomena. It is actually not present and is drawn with a dotted line. It plays an important role in the study of optical problems. First, the normal line is to understand the basis of the light path diagram. Some students are not able to understand several of the drawings in the textbook. The reason is that these light path diagrams draw less normal lines. As in?