In article <3c9a743a$1@news.povray.org>, "RAY" <RAY### [at] yahoocom> 
wrote:

> >   That's not refraction but interference, which is a completely different
> > phenomenon.
> The light refracts through the slits, causing the light not to be two
> parallel lines.

That isn't refraction, it is diffraction. Refraction is bending of light 
at the interface of two media with different optical densities (which 
doesn't have anything to do with their physical density).

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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