我们生活在一个光明的世界里,早晨,太阳从东方冉冉升起,朝霞映红了海面;中午烈日当空,光芒万丈;傍晚,几度夕阳红;还有光怪陆离的霓红灯在装点着繁华都市的夜空,使黑夜变得绚丽多彩.我们能够看见这些“发光体”,是因为发光体发出的光进入了我们的眼睛.那么,光是怎样传播的呢?在暗室的窗上开一个小孔,让一束阳光从小孔射入空气中,可以看到这束阳光的传播路径是直的;用一透明玻璃砖挡在激光的传播方向上,发现激光在玻璃砖中的传播路径也是直的.可见,光在同种均匀物质中是沿直线传播的. We live in a bright world. In the morning, the sun rises from the east and shines into the sea. In the hot sun at noon, the light shines. In the evening, there are red sunsets. There are neon red lights in the bustling city. The night sky makes the night colorful. We can see these “lights” because the light emitted by the light enters our eyes. Then, how does light spread? Open a hole in the window of the dark room. Let a beam of sunlight enter the air from the small hole, and you can see that the transmission path of the sunlight is straight; with a transparent glass block in the direction of propagation of the laser, it is found that the propagation path of the laser in the glass brick is also straight. It can be seen that light travels along a straight line in homogeneous homogeneous matter.