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Forum: Processes Involving Optical Photons
Re: Question Boundary absorption or transmission?
Date: 25 Mar, 2010
From: Gumplinger Peter <Gumplinger Peter>

Let's ask what is going on on a dielectric surface in contact with another dielectric surface. Ideally, only Snell's Law applies. Now, let's assume the surface is 'dirty' and the dirt absorbs some of the photons. Let me suggest that this is going to happen regardless of whether Snell's Law results in reflection or transmission. - But yes, assigning a <1 'reflectivity' to such an interface is a misnomer. It should more properly be named '1-surface absorption'. That the code reads !G4BooleanRand(theReflectivity) is a result of code migration. Originally, there was no 'surface absorption' in the code for dielectric_dielectric interfaces until some users requested this, but there was a finite 'reflectivity' for dielectric_metal surfaces.

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