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Homework Help: Laser Beam

  1. Jun 29, 2008 #1
    Information is stored in a series of pits on the disc. These pits are scanned by a laser beam. An significant limitation on amount of information that can be stored on a disc is width of laser beam.

    I knew why the width of laser beam is important coz diffraction effect of loght.

    But, i dunoe how using shorter-wavelength laser allows more information to be stored on disc of same size......HOW???
  2. jcsd
  3. Jun 29, 2008 #2
    Well, the diffraction effects you mentioned, do they depend on wavelength? ;)
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