Rainbows form when sunlight is refracted, then reflected by raindrops, breaking the white light into the colours of the spectrum. On occasion, the coloured light is reflected from both the front and the back of the raindrops and 2 rainbows are visible. When this happens the bands of colour in the second rainbow are displayed in the opposite order of those in the primary rainbow which displays red on the outside and violet on the inside. To see a rainbow, you must have your back to the sun and face the rain shower.
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