How to measure light wavelength exactly?

  1. Hi people,

    does anybody know what the simplest device that can be used to measure monochromatic light wavelength exactly? Thanks.
  2. jcsd
  3. OlderDan

    OlderDan 3,031
    Science Advisor
    Homework Helper

    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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