Red | Description, Etymology, & Facts | Britannica
https://www.britannica.com/science/red-color
WEBApr 12, 2024 · Red, in physics, the longest wavelength of light discernible to the human eye. It falls in the range of 620–750 nanometers in the visible spectrum. In art, red is a color on the conventional wheel, located between violet and orange and opposite green, its complement.
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