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Update for 10-11-22 20:15

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Tyler Perkins 2022-11-10 20:15:01 -05:00
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@ -6,8 +6,29 @@ What is radiant flux?
* total amount of energy passing through a surface (measured per second)
* Radiant flux in Watts or Joules/second
Why do we not use radiant flux?
=== Why do we not use radiant flux? ===
* When we emasure a high flux val, we dont know if lots of energy through a
small surface, or a little energy through a huge surface
* TLDR its to ambiguous
New unit irradiance
* Flux per unit area
* IE Watt/m^2
=== Why do we not use irradiance? ===
We know the surface, but we still need an angle
* Could be lost of energy in a huge angle
* little energy in a small angle
New unit Radiance
* Flux per unit area angle
* W / (m^2 * radians)
== Basic question ==
How do we calculate how much light exits a surface point in a given direction
[[maxwell_equations|Maxwell equations]]!