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Homework Help: LASER colors function

  1. Aug 3, 2005 #1
    Hi Guys!

    My teacher once asked me the following question:

    Lasers are used to burn and read CDs. Why a laser that emits blue light would be capable of burning and reading more than the one with red light.

    Can u tell me the answer
  2. jcsd
  3. Aug 3, 2005 #2
    more energy. (for light/photons, energy is proportional to frequency.)
  4. Aug 3, 2005 #3

    Dr Transport

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    Science Advisor
    Gold Member

    The wavelength of a blue laser is shorter than that of a red laser. The density of the tracks on a disk is inversely proportional to the read/write wavelength.
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