1.利用光的折射规律判断光路光的折射规律是:光从空气斜射入水或其他介质中时,折射光线、入射光线与法线在同一平面上;折射光线和入射光线分居法线两侧;折射角小于入射角;入射角增大时,折射角也随着增大;当光线垂直射向界面时,传播方向不改变. 1. Use the law of light refraction to determine the refraction law of the light path: when light enters water or other medium obliquely from air, the refracted light and the incident light are in the same plane as the normal; the refracted light and incident light are separated on both sides of the normal line; The refraction angle is smaller than the incident angle; when the incident angle increases, the refraction angle also increases; when the light is directed perpendicularly to the interface, the propagation direction does not change.