> Reflection is an inherent effect on all interfaces between materials of
> different optical density (i.e. ior, speed of light in the material)

Right. That would seem to explain why no one has ever managed to make
invisible glass for windows yet...

> The amount of reflection depending on the incident angle and the materials
> can be calculated with the fresnel equations.  This works for both a
> transit from less dense to more dense medium as well as the other way
> round.  More information can be found in the links from:
>
>
http://www-public.tu-bs.de:8080/~y0013390/pov/water/water_app1.html#reflect

...and once again I'm left saying I'll check it out later... oh to have more
time! lol

Thanks.
Andrew.

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