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In the middle of the electromagnetic spectrum is visible light, i.e. the range in which the human eye has evolved to observe. The following is a chart of the wavelengths of visible light.
Color Wavelength (m) near ultraviolet 3.0 e -7 shortest visible blue 4.0 e -7 blue 4.6 e -7 green 5.4 e -7 yellow 5.9 e -7 orange 6.1 e -7 longest visible red 7.6 e -7 near infrared 1.0 e -6 (Table 9.1, Griffiths)