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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)