About radiance equation in Radiometry

  • Thread starter dammage
  • Start date
  • #1
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Homework Statement


According to some pages on web, differential formular for calculating radiance L is :

L = d2P / ( dA*cos(a)*dw)

L : radiance
P : power flux
A*cos(a) : projected area
w : solid angle

Please tell me why does power P has derivaties two times d2P ?



Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
ideasrule
Homework Helper
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Because radiance is power per unit area, per solid angle.
 
  • #3
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Ah, I understand now. Thank you !
 

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