【知识要点】一、光的直线传播1郾的物体叫做光源,太阳是一个巨大的光源,月亮光源郾2郾光在均匀介质中沿传播郾日食、月食、激光准直、影的形成、小孔成像等都可以用来解释郾3.光在不同介质中的传播速度一般不同,其中光在中的传播速度最大,为m/s.二、光的反射1.我们能看见不发 [Knowledge points] First, the light of the straight line propagation 1 郾 object called the light source, the sun is a huge light source, the moon light source 郾 2 郾 light in a uniform medium along the spread 郾 Eclipse, lunar eclipse, laser alignment, the formation of shadow , hole imaging, etc. can all be used to explain 郾 3. The speed of light propagation in different media is generally different, in which light travels at a maximum speed, m/s. Second, the reflection of light 1. We can see no hair