The Electronmagnetic Spectrum
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    It is convenient to measure the wavelength of visible light in units called nanometers.  A nanometer (nm) is one billionth of a meter.  The  colors of visible light hat we see and their wavelengths in nanometers are shown below


                                      700-650nm          650-600nm        600 - 550nm      550 - 500nm       500-450nm      450-400nm