Incident light angle brightness

  • Thread starter pikapika!
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  • #1
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when light hits a surface at an angle. it is darker if it hits it at higher angle(facing away) than at a lower angle(facing towards). 1


Is there a formula for the brightness.The relationship of angle to brightness does not look linear.


http://www.vam.ac.uk/vastatic/microsites/1384_leonardo/animated_illustrations/view/?movie=light" [Broken]1
 
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  • #2
Meir Achuz
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The brightness would go like cos of the angle.
 
  • #3
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Is this only because the greater the angle, the greater the surface area that the beam interacts with? Or are there other factors?
 
  • #4
Meir Achuz
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It is just that Intensity = Power/area
 
  • #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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