Glossary term: 彩虹
Description: 彩虹是一种巨大的弧形或弓形，自内而外有着紫色、靛色、蓝色、绿色、黄色、橙色和红色的同心条纹，横跨天空，通常在下过雨后才能看到。观察者需要背对太阳才能看到彩虹。彩虹之所以出现，是因为空气中的小水滴通过折射将白色阳光分解成彩色光谱，这个过程叫做色散，与三棱镜的工作原理类似。在一般的彩虹中，阳光在水滴内不但通过折射而被色散，还发生了一次反射。
有时可以看到两条套在一起的彩虹，第二条彩虹的颜色顺序与第一条恰好相反。内侧较亮的彩虹称为主虹，外侧较暗的彩虹称为副虹（又称为霓）。这种双彩虹现象并不常见。当阳光在水滴内除了折射外还发生了两次反射时，就会出现双彩虹。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
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