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Disagree Re: wrapped cerenkov 

Forum: Processes Involving Optical Photons
Date: 31 Jul, 2006
From: Gumplinger Peter <Gumplinger Peter>

In my reply above, I wrote

> while:
>
> SMPT -> AddProperty("REFLECTIVITY",pp,reflectivity,NUM);
>
> and 'polishedbackpainted' or 'groundbackpainted' concern the wrapping.

but what I meant to say is that the 'backpainted' part of the specification specifies a wrapping. In truth, the 'polished' and 'ground' part of the specification concern the initial interface between the radiator and the thin dielectric layer.

Similarly, I was wrong in writing:

> SetFinish(groundbackpainted) or SetFinish(polishedbackpainted)
>
> depending on whether your wrapping is a diffuse or polished reflector.

The wrapping itself is ALWAYS assumed to be a Lambertian reflector; i.e. an "external diffuse reflector" for those photons which are refracted (transmitted) through the surface interface into the thin dielectric layer.

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