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Photo sensors

  1. Apr 26, 2006 #1
    Help! is a photo detector the same as photosensor? can they be specifically for infrared light? and what does point source mean?
  2. jcsd
  3. Apr 26, 2006 #2
    Well point source means exactly that. A point-like source of radiation. I'd say they are the same, but it might depend on the context. And yeah, you can usually get a detector specifically for your region of interest in the em spectrum.
  4. Apr 27, 2006 #3
    so does point sourc light spread out? so that the intensity is inversly proportional to the square of the distance from source?
  5. Apr 27, 2006 #4
    please could you tell me what is the symbol for a infrared source and detector?

  6. Apr 27, 2006 #5
    yes that's right.
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