A rainbow is an optical and meteorological phenomenon that is caused by reflection of light in water droplets in the Earth's atmosphere, resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc.
Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
In a "primary rainbow", the arc shows red on the outer part and
violet on the inner side. This rainbow is caused by light being
refracted while entering a droplet of water, then reflected inside on
the back of the droplet and refracted again when leaving it.
In a double rainbow, a second arc is seen outside the primary arc,
and has the order of its colours reversed, red facing toward the other
one, in both rainbows. This second rainbow is caused by light reflecting
twice inside water droplets.
Source: Wikipedia
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