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Problem: Radiance of an undirectional light source  

Radiance, Lu, of a unidirectional light source can be defined as follows:

 Lu(z = 0, ξ) = Eu0 δ(ξ - ξ0)  (1)

at z = 0, i.e. at the source itself. In the above equation, ξ is the direction unit vector, ξ0 is the unit vector of the source beam axis, δ is the Dirac delta function, and Eu0 is the irradiance generated by the source at z = 0.

  1. Why is irradiance used in Eq. 1?
  2. What is the dimension of the Dirac delta function, as applicable here, and why?
CITATION:
Jonasz M. 2006. Problem: Radiance of an undirectional light source (www.tpdsci.com/Tpc/RdmUnidir_P.php). In: Top. Part. Disp. Sci. (www.tpdsci.com). 		HISTORY:
Published: 29-Aug-2007
Modified: 31-Aug-2007
Peer-reviewed: PENDING
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