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Incident light angle brightness

by pikapika!
Tags: angle, brightness, incident, light
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pikapika!
#1
Feb22-07, 07:50 PM
P: 31
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/micros...w/?movie=light1
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Meir Achuz
#2
Feb23-07, 12:55 PM
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PF Gold
P: 2,015
The brightness would go like cos of the angle.
cesiumfrog
#3
Feb23-07, 04:46 PM
P: 2,051
Is this only because the greater the angle, the greater the surface area that the beam interacts with? Or are there other factors?

Meir Achuz
#4
Feb24-07, 07:47 AM
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PF Gold
P: 2,015
Incident light angle brightness

It is just that Intensity = Power/area
robphy
#5
Feb24-07, 02:50 PM
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PF Gold
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P: 4,137
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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