我们能够看到太阳、电灯等光源.是因为光源发出的光进入了我们的眼睛.但有些物体不是光源,如桌子、课本等,我们为什么也能看到它们呢?原来是这些物体反射的光进入了我们的眼睛.如图1.光的反射光射向物体表面时.有一部分光返回到原来介质中的现象.叫作光的反射.为了研究方便,我们在反射现象中引入几个概念.如图2,在平面内,光线AO沿某个角度射到O点,经反射面反射,沿OB方向射出.1.入射点:O点为入射点.2.入射光线:A O称为入射光线. We can see the sun, electric lights and other light sources. The light from the light source enters our eyes. But some objects are not light sources, such as tables, textbooks, etc. Why can we see them? The light reflected by these objects is the original light. Into our eyes, as shown in Figure 1. When the reflected light of light strikes the surface of the object, there is a phenomenon in which part of the light is returned to the original medium. This is called the reflection of light. In order to facilitate research, we introduce several concepts in the reflection phenomenon. In Fig. 2, in the plane, the light AO strikes the O point along a certain angle, is reflected by the reflecting surface, and is emitted in the OB direction. 1. The incident point: The O point is the incident point. 2. The incident light: AO is called incidence Light.