Neeum Zawan wrote:
>     Don't really know. However, I think it does agree on the physics 
> behind refractive index. It's just a function of the permittivity, which 
> electromagnetics precisely describes (in terms of waves). I don't know 
> if there's a "particle" explanation.

IIRC, it's accurate enough that predictions of refraction based on 
permittivity yield correct results, even for fringe cases like negative 
or really high indices of refraction.

-- 
Chambers

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