一、知识要点1.透镜成像所遵循的规律——光的折射定律光的折射定律内容为:①折射光线、入射光线和法线在同一平面内,折射光线和入射光线分居在法线两侧;②当光从空气斜射入水中或其它透明介质中时,折射角小于入射角;反之折射角大于入射角.③入射角增大时,折射角也增大.④当光线垂直射向 First, the knowledge points 1. The lens follows the law - the law of light refraction The law of light refraction: 1Refracted light, incident light and normal in the same plane, refracted light and incident light separated on both sides of the normal 2When the light is obliquely injected into the water or other transparent medium from air, the refraction angle is smaller than the incident angle; conversely, the refraction angle is greater than the incident angle.3 When the incident angle increases, the refraction angle also increases.4When the light is directed perpendicularly