1、为什么常用红光表示危险信号?汽车遇到红灯就要停下来,在修马路时,到了晚上修理点亮起红灯;汽车的尾灯也都做成红色。为什么常用红光来表示危险的信号呢?红光颜色鲜艳,给人一种醒目的感觉,是否仅此而已?不是的,这里面还包含着许多重要的光学知识。我们知道,白光里面包含着红、橙、黄、绿、蓝、靛、紫七种颜色的光。不同颜色的光,波长不一样,其中红光的波长最长,它能绕过雨点、尘埃、雾珠等细小微粒;紫光波长最短,当光照在空中细小的微粒上时,波长较短的光,像蓝光、紫光都容易被散射开来,从而偏离原来的方向;而波 1. Why do you often use red light to indicate a dangerous signal? When a car meets a red light, it must stop. At the time of repairing a road, it is repaired at night to light a red light; the rear light of a car is also made red. Why is red light used to indicate a dangerous signal? Red light is bright and gives a noticeable feeling. Is it just that? No, it also contains a lot of important optical knowledge. We know that white light contains seven colors of light: red, orange, yellow, green, blue, neon, and purple. Different colors of light, the wavelength is not the same, of which the longest wavelength of red light, it can bypass the rain particles, dust, mist beads and other fine particles; violet wavelength is the shortest, when the light shines on the fine particles in the air, the shorter wavelength light Like blue light and purple light are easily scattered away from the original direction;