incident light angle brightness

by pikapika!
Tags: angle, brightness, incident, light
pikapika! is offline
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.
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Meir Achuz
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Feb23-07, 12:55 PM
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The brightness would go like cos of the angle.
cesiumfrog is offline
Feb23-07, 04:46 PM
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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?

Meir Achuz
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Feb24-07, 07:47 AM
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incident light angle brightness

It is just that Intensity = Power/area
robphy is offline
Feb24-07, 02:50 PM
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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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