十万个为什么·科学阅读30篇（6）
1 / 30
正在确认阅读权限…
Why Do Rainbows Appear After Rain?
为什么雨后会出现彩虹？
-
Rainbows form when sunlight meets raindrops.彩虹在阳光照射雨滴时形成。
-
Light bends as it enters each raindrop.光线进入每颗雨滴时发生弯曲。
-
It also splits into red, orange, yellow, green, blue, indigo and violet.同时分解为红、橙、黄、绿、蓝、靛、紫七种颜色。
-
This split is called dispersion.这种分解现象称为色散。
-
The light bounces inside the drop and exits at a new angle.光线在雨滴内反射后以新角度射出。
-
Our eyes see this colorful arc in the sky.我们的眼睛在天空中看到这道彩色弧形。
-
You must stand with your back to the sun to see one.要看到彩虹，必须背对太阳站立。
-
Rainbows always face away from the sun.彩虹总是朝向背离太阳的方向。