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How to measure light wavelength exactly?

  1. Jun 13, 2005 #1
    Hi people,

    does anybody know what the simplest device that can be used to measure monochromatic light wavelength exactly? Thanks.
  2. jcsd
  3. Jun 13, 2005 #2


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    The simplest ways I can think of involve interference. For example, you can use:
    A diffraction grating (probably the best)
    A pair of optical flats with high precision spacers
    An optical flat and a precision plano convex lens of known radius to form Newton's rings.
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