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I believe Ken means light only enters the medium and is refracted if it is not
reflected. Light can be partially reflected or refracted, but only one of the
two can happen on a photon by photon basis.
Margus
"Jerome M. BERGER" wrote:
>
> ??? What do you mean "mutually exclusive"? In most cases, both occur
> simultaneously (each time you change medium: air/water, air/glass, ...).
> The only cases I can think of where you can have one without the other
> is the mirage (or anytime the IOR changes continuously) where you only
> have refraction and the metallic surface where you have no transmitted
> light (and therefore no refraction...)
>
> Jerome
>
> --
> *******************************
> * they'll tell you what can't * mailto:ber### [at] iname com
> * be done and why... * http://www.enst.fr/~jberger
> * Then do it. *
> *******************************
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