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Two slit interference and diffraction

  1. Mar 3, 2005 #1
    why is it better to use red light , instead of blue or white light, for 2 slit interference and diffraction measurements?
  2. jcsd
  3. Mar 3, 2005 #2


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    It's better for the radiation to be monochromatic (laser beam,if possible),so white light is outta the question.As for what color,maybe the fringes look better in red...?


    P.S.Neon laser is pretty common in optics.That line is in the red part of spectrum.
  4. Mar 6, 2005 #3

    Claude Bile

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    Red HeNe lasers are very cheap. Blue lasers, on the other hand are very expensive.

  5. Mar 6, 2005 #4
    Red laser light also has a larger wavelength than blue light. Therefore creating a larger seperation in the fringes, allowing for a magnifies effect.


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