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The colors of light are determined by the frequency or wave length of light rays. Sunlight

contains all colors. In the case of a rainbow the atmosphere separates these colors

spreading them out. Red is the lowest frequency and thus comes first. Violet is highest

frequency and thus comes last.

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Doesn't the whole thing depend on which end you decide to start naming the colors from ? ?

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10y ago
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Q: Why is the first color of a rainbow red?
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