初中阶段遇到的画光路问题的解题依据主要是光的传播、反射和折射规律．因此要正确画出光路图，必须懂得分析光线传播的情况，并正确理解有关的概念．如入射角、反射角、折射角、像点的概念、平面镜和凸透镜成像规律等．下面我们分别以例题进行具体说明，怎样才能应用有关知识 The solving problem of the painting light path problem encountered in junior high school is mainly the law of light propagation, reflection and refraction. Therefore, to draw the light path diagram correctly, one must understand how the light is transmitted and correctly understand the concept. Such as incident angle, reflection angle, refraction angle, concept of image point, plane mirror and convex lens imaging law. Below we will give specific explanations of examples and how to apply the relevant knowledge.