“光学”是初中物理教学的难点之一,尤其是根据光路的改变来判断几何光学仪器更为突出。大多数学生在学习过程中,对此不能做到真正理解和认识,究其原因,是没有摸清规律造成的。如何解决这个问题呢?在此,谈一谈我个人的浅见。光路的改变不外乎两种:一种是反射,一种是折射。凡是改变后的光线与入射光线在光学仪器同侧的,都属于反射,此仪器必定是面镜,包括三种:凸镜、凹镜和平面镜;凡是改变 “Optical” is one of the difficulties in the teaching of junior high school physics, especially in light of the changes in the optical path to determine the geometric optical instruments more prominent. In the process of learning, most students cannot truly understand and understand this. The reason for this is that they did not understand the rules. How to solve this problem? Here, talk about my personal views. The change of light path is nothing more than two kinds: one is reflection and the other is refraction. All changed light and incident light on the same side of the optical instrument are reflections, this instrument must be a mirror, including three kinds: convex mirror, concave mirror and plane mirror; all change