rainbow
rainbow Multicoloured band, usually seen as an arc opposite to the Sun or other light source. The primary bow is the one usually seen; in it the colours are arranged from red at the top to violet at the bottom. A secondary bow, in which the order of the colours is reversed, is sometimes seen beyond the primary bow. The colours are caused by reflection of light within raindrops, which cause white light to be dispersed into its constituent wavelengths. The colours seen are those of the visible spectrum: red, orange, yellow, green, blue, indigo, and violet.
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rainbow
