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Light source

  1. Nov 14, 2007 #1
    what do we mean when we say a point light source is [tex]5.0 mW[/tex]
     
    Last edited: Nov 14, 2007
  2. jcsd
  3. Nov 14, 2007 #2

    mgb_phys

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    That is an energy - so not very useful, unless it means 5.0mJ/s ie 5milliWatts.

    In astronomy it could be a typo for mJy = milli Jansky bit this isn't commonly used for visible light
     
    Last edited: Nov 15, 2007
  4. Nov 14, 2007 #3
    sorry that was watt.
     
  5. Nov 15, 2007 #4

    Shooting Star

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    It's not energy, it's power. It means the light source is giving out energy at the rate of 5 J/s.
     
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