光的反射和折射是光学实验的重点和难点,做好这些实验,对学生掌握反射定律、平面镜成像原理、球面镜对光的作用、透镜对光的作用、凸透镜成像原理等重要知识具有决定性的影响。但用现有实验装置,在一般环境亮度下光路的可见度很低,效果极差。针对上述问题,我们经过反复实验,制成了折反射演示仪。它具有可见度高,光路清晰,使用方便,应用面广等特点。 The reflection and refraction of light is the focus and difficulty of optical experiments. Doing these experiments has a decisive influence on students’ mastery of reflection laws, principle of plane mirror imaging, effects of spherical mirrors on light, role of lenses on light, principle of convex lens imaging, and other important knowledge. . However, with the existing experimental device, the visibility of the optical path under normal ambient brightness is very low and the effect is extremely poor. In response to the above problems, we made a catadioptric demonstration instrument after repeated experiments. It has high visibility, clear light path, easy to use, wide application and so on.