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How can a surface be polished for some waves and not others?

  1. Mar 10, 2008 #1
    [SOLVED] How can a surface be polished for some waves and not others?

    The question is above...
    Thanks
     
  2. jcsd
  3. Mar 10, 2008 #2

    mgb_phys

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    A surface is always smoother (more polished) for a longer wavelength.
    So a piece of wood is pretty smooth to 3cm microwaves but is not really lambda/20 for visible light!
     
  4. Mar 10, 2008 #3
    thanks so much...I was thinking about writing just that but wasn't too sure.

    thanks
     
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