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高中物理课本第二册(必修)190页中,介绍了光的全反射现象的演示实验.该实验是利用半圆形玻璃砖来演示的,从表面上看很容易演示成功,但我在教学实践中发现,学生不易观察到入射光线和反射光线,而折射光线更难发现,其原因是在玻璃和空气中都不易观察到光线的传播路径.因而,就看不到:当光从玻璃射入空气时,随入射角逐渐增大,折射光线离法线越来越远,而且越来越弱,反射光线起来越强的现象.为此,我对本实验作了改进.
In the second volume (required) of High School Physics Textbook 2 (Required), 190 pages, a demonstration experiment of the phenomenon of total reflection of light is introduced. This experiment was demonstrated using semi-circular glass bricks. From the surface, it is easy to demonstrate success, but I am teaching practice. Found that students can not easily observe the incident light and reflected light, and refracted light is more difficult to find, because the light is not easy to observe the path of light in the glass and air. Therefore, you can not see: when the light from the glass injection In the air, as the incident angle gradually increases, the refracted light is getting farther and farther from the normal line, and getting weaker and weaker, the stronger the reflected light is. For this reason, I have improved this experiment.