观行初高中物理教材关于光的直进、折射、全反射的演示实验都存在着不易观察到光路的缺陷，即使使用激光光源；但效果还是不尽如人意。对于实验器材缺乏的一些农村中学，难以找到理想的光源，利用太阳光又受到气候等诸多因素的影响，于是实验也就变成了“板画”，学生没有直观 At the beginning and end of the high school physics textbooks, there are defects in the demonstration experiments of direct light, refraction, and total reflection, which are not easy to observe the light path. Even if a laser light source is used, the effect is still not satisfactory. For some rural middle schools that are lack of experimental equipment, it is difficult to find the ideal light source, and the use of sunlight is affected by many factors such as climate, so the experiment has become a “plate painting” and the students are not intuitive.