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一、一点、一面、三线、两角如图1,AO是入射光线,OB是反射光线,O点叫做入射点,PQ是使入射光线发生反射的物体表面,叫做反射面.过入射点O作反射面PQ的垂线ON,ON就是法线.入射光线和反射光线是客观存在的,但法线却是人们为了方便地研究光学问题而引入的一条辅助线.有了法线的概念,才会有入射角和反射角的概念,入射角是入射光
AO is the incident light, OB is the reflected light, O point is called the incident point, PQ is to make the reflected light incident surface of the object, called the reflective surface. O-point for the incident The vertical lines ON and ON of the reflection surface PQ are normal lines.It is an objective existence that the incident light and the reflected light exist.However, the normal line is an auxiliary line introduced by people in order to study the optical problem conveniently.With the normal concept There will be the concept of angle of incidence and reflection angle of incidence is the incident light