光的折射是与光的直线传播和光的反射都不同的又一种传播方式,是光由一种物质进入另一种物质时传播方向发生改变的现象.学习光的折射重点是掌握光的折射规律,要弄清一点(入射点),两角(折射角、入射角),三线(入射光线、法线、折射光线)以及它们之间的关系.光从空气射入其他介质或从其他介质射入空气中时,若发生折射,不论是入射角还是折射角都是在空气一侧中的角度大,且入射角增大或减小时,折射角也随之增大或减小.而当光线垂直射到两种介质的表面时,传播方向不改变.在光的折射中,一定要注意光路是可逆的. The refraction of light is another kind of propagation mode that is different from the linear propagation of light and the reflection of light. It is the phenomenon that the direction of light changes when light enters from one substance to another. Learning light refraction focuses on grasping the refraction of light. Regularities, to clarify a point (incident point), two corners (refractive angle, incident angle), three lines (incident light, normal, refracted light) and the relationship between them. Light from the air into other media or from other media When refraction occurs in the air, both the incident angle and the refraction angle are large in the air side, and when the incident angle increases or decreases, the refraction angle also increases or decreases. When the light hits the surface of the two media perpendicularly, the direction of propagation does not change. In the refraction of light, it must be noted that the light path is reversible.