Description
指挥交通的红绿灯中有红灯；汽车的尾灯、转向灯也用红灯；电影院、礼堂、体育场等公共场所的安全门上也用红灯，还有其他很多的地方都用红灯做标志。在众多色彩中，为什么人们偏偏对红色“情有独钟”呢？原来这里面包含着一个重要的光学原理。太阳光即所谓的白光里面包含有红、橙、黄、绿、青、蓝、紫七种颜色的光，颜色不同，波长也各不一样。其中，红光的波长最长，有0.75微米，它能轻松地穿过小雨点、尘埃、雾珠等细小的微粒，并且不容易被散射。所以，即便在雨天、雾天和沙尘天，行人和车辆照样可以看清红绿灯、尾灯和转向灯，从而避免了许多交通事故的发生。
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