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Incident light angle brightness

  1. Feb 22, 2007 #1
  2. jcsd
  3. Feb 23, 2007 #2

    Meir Achuz

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    The brightness would go like cos of the angle.
     
  4. Feb 23, 2007 #3
    Is this only because the greater the angle, the greater the surface area that the beam interacts with? Or are there other factors?
     
  5. Feb 24, 2007 #4

    Meir Achuz

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    It is just that Intensity = Power/area
     
  6. Feb 24, 2007 #5

    robphy

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    There is also an inverse-square dependence, which is negligible if (for example) a point-like source is very far from the surface.
     
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