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2019二年级语文下册课文516《雷雨》拓展知识：彩虹素材新人教版.doc

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1彩虹彩虹，又称天虹，简称为“虹” ，是气象中的一种光学现象。当太阳光照射到空气中的水滴，光线被折射及反射，在天空上形成拱形的七彩光谱，雨后常见。形状弯曲，通常为半圆状，色彩艳丽。东亚、中国对于七色光的最普遍说法（按波长从小至大排序）：红、橙、黄、绿、蓝、靛（din） 、紫。

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