scott wrote:
...
> For example, you know how light "bends" when it enters eg glass, well 
> how much it bends is related to the refractive index of the material.  
> And if you know the "electrical" properties you can calculate this 
> refractive index exactly (it's the square root of permittivity times 
> permeablility of the material).
...

Heh - now you just reminded my of this Google calculator expression:

http://www.google.no/search?q=speed+of+light+times+square+root+of+%28permittivity+of+free+space+times+permeability+of+free+space%29
http://tinyurl.com/5etcgr

-- 
Tor Olav
http://subcube.com

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