光从一种介质中传播到另一种介质中时,在介质交界面反射回原介质的现象叫做光的反射,被反射回原介质的光线称为反射光线,入射到交界面的光线称为入射光线.如图1,由光的反射规律知:(1)入射光线CO与反射光线DO及法线 When light propagates from one medium to another medium, the phenomenon that the light is reflected back to the original medium at the medium interface is called the reflection of light, the light reflected back to the original medium is called reflected light, and the light incident on the interface is called As shown in Figure 1, by the light reflection law: (1) Incident light CO and reflected light DO and normal