A rainbow is a phenomenon that is caused by reflection, dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc. Rainbows can be full circles.
In a primary rainbow, the arc shows red on the outer part and violet on the inner side. In a double rainbow, a second arc is seen outside the primary arc, and has the order of its colours reversed, with red on the inner side of the arc.
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