Blue | Description, Etymology, & Facts | Britannica
https://www.britannica.com/science/blue-color
webMar 9, 2024 · blue, in physics, light in the wavelength range of 450–495 nanometres in the visible spectrum. After violet, blue is the spectral region with the shortest wavelengths discernible to the human eye. In art, blue is a colour on the conventional colour wheel, located between green and violet and opposite orange, its ccomplementary colour.
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