光是沿直线传播的,这是光的传播特征之一。为了让学生认识这一传播特征,湖北省编《自然》第十二册设置了实验:用一张纸卷成细纸筒,用它来看灯光,再把纸筒折弯看灯光。意图通过学生观察到的两种截然不同的现象,来说明光是沿直线传播的。然而在实际教学中,效果欠佳,容易造成误解而事与愿违。 Light is transmitted along a straight line, which is one of the light propagation characteristics. In order to make students aware of this spreading feature, Hubei Province edited “Nature” Book XII and set up experiments: using a piece of paper roll into a thin paper tube, using it to look at the light, then bending the paper tube to see the light. The intention is to illustrate that light travels in a straight line by two very different phenomena observed by students. However, in actual teaching, the effect is not good, easily lead to misunderstanding and contrary to expectations.