"Warp" <war### [at] tagpovrayorg> wrote in message
news:3c90ba08@news.povray.org...

>One such situation
> is when a photon can collide with a free electron, deviating its course
> (I don't remember the name of this effect).

Compton Scaterring

>   There are situations where the wave-nature of light is visible to the
> naked eye, for example some interference effects. However, as I said, this
> is just too difficult to model and seldom useful as well.
>
This is the Young double slit experiment.  Check out this web site:
http://members.tripod.com/~vsg/interf.htm
Maan

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