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People think of objects as having color. The actual explanation for color is because the molecules that make up the object absorb certain light waves of color, leaving the other light waves of color to bounce off. The human eye sees the wavelengths of all of the light that was not absorbed, and the combination of those colors gives the brain with the impression of a color. A white object would absorb almost no light, while a black one would absorb almost all light hitting it. Red objects reflect only red light and absorb all the other colors. White light consists of all of the colors in the visible spectrum; thus white light can be split into all of the colors of the visible spectrum when passed through a glass prism.

The colors of the visible light spectrum
Color Wavelength
interval
Frequency
interval
     Red ~ 700–635 nm ~ 430–480 THz
     Orange ~ 635–590 nm ~ 480–510 THz
     Yellow ~ 590–560 nm ~ 510–540 THz
     Green ~ 560–520 nm ~ 540–580 THz
     Cyan ~ 520–490 nm ~ 580–610 THz
     Blue ~ 490–450 nm ~ 610–670 THz
     Violet or Purple ~ 450–400 nm ~ 670–750 THz

References

ISBN 3527405038