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初三物理教材中有一个测定玻璃折射率的实验,这个实验对于我们设备条件很差的农村中学是无法做成的。(全校没有一块平行玻璃砖)虽然学生在日常生活中知道存在着光的折射现象,但定量地测定一种媒质的折射率,还没有做过,因而做好这个实验很有必要。我们因陋就简,选用较厚的冰块来做,取得了与玻璃同样的效果,这个方法在苏北地区的农村中学均可实行。
In the third grade physics textbook, there is an experiment for measuring the refractive index of glass. This experiment cannot be done for rural middle schools whose equipment conditions are poor. (The school does not have a parallel glass brick.) Although students in daily life know that there is a phenomenon of light refraction, but the quantitative determination of the refractive index of a medium has not been done, so it is necessary to do this experiment. We use simple ice cubes instead of simple ones to achieve the same effect as glass. This method can be implemented in rural middle schools in northern Jiangsu.