在中学物理教学中,光的折射是光学部分的重要内容,但教材中只介绍了测量玻璃砖的折射率的方法,没有介绍测量液体折射率的方法。传统演示光的折射的方法是:用线光源打在盛水容器的侧壁上发生漫反射的亮线代替入射光和折射光。这种方法理论上有错误,因为亮线不是入射光和折射光,光线在透明介质中是不能被观察到的,有些教师在空气中喷烟 In high school physics teaching, the refraction of light is an important part of the optics. However, only the method of measuring the refractive index of the glass brick is introduced in the teaching materials, and the method of measuring the refractive index of the liquid glass is not introduced. The traditional method of refraction of light is: instead of incident light and refracted light, a diffusely bright line is formed on the side wall of the water container with a line light source. This method is theoretically wrong, because the bright line is not incident light and refracted light, the light can not be observed in the transparent medium, some teachers smoke in the air