今天,姚老师在上初一《科学》第一章中“光的折射”这一课题,她先做了一个实验:让光从空气斜射入半圆形玻璃砖的平面上,学生看到光进入玻璃砖后,在玻璃砖内光路发生了偏折,折射角小于入射角,如图1所示。然后将这一现象进行拓广,指出:光从空气进入水内。也会出现同样的现象,像这种光从一种物质进入另一种物质后,光路发生偏折的现象,叫做光的折射。在这一基础上,姚老师又问学生:如果让光从水中斜射到空气(如图2),光路将会发生怎样的变化呢?并要求学生进行猜测,把猜测的结果画在图上。 Today, on the subject of “Light Refraction” in the first chapter of the first chapter of Science, Teacher Yao first conducted an experiment in which light was obliquely incident on the plane of a semi-circular glass brick from air and students saw it After the light enters the glass brick, the light path in the glass brick deflected, the refraction angle is less than the incident angle, as shown in FIG. 1. This phenomenon is then broadened to point out that light enters the water from the air. The same phenomenon can also occur, such as light from one material into another material, the optical path deflection phenomenon, called the refraction of light. On this basis, Teacher Yao asked the students again: How will the optical path change if light is allowed to be leveled into the air from the water (Figure 2)? Students are also required to guess and draw the result of the guesswork on the graph.