Ken wrote:
> 
> Mike wrote:
> >
> > I have a book that talks about diffraction gratings.  Says a typical one
> > has 14,000 to 15,000 rulings per inch and that for maximum efficiency
> > the seperation of them should be on the order of 1/50,000 inch, or about
> > the wavelength of light.
> >
> > I would think aliasing would be a problem. ;)
> >
> > -Mike
> 
> Wouldn't that depend on how far the camera were placed from the surface ?
> 
> --
> Ken Tyler
> 

How close do you want to get?  ;-)

Seriously... doing this kind of diffraction would be very difficult.  First,
as someone else mentioned, it would require backwards ray tracing.
Secondly, it would require modeling light as waves instead of particles.
The ray-tracing model can be visualized as lots of tiny particles flying
through space.  I'm not sure how you'd change this model to incorporate
expanding wavefronts.

If anyone has any ideas, I'd be interested to hear them.  Keep in mind
the very small size of these objects/slits that will be causing
diffraction, and how dense you would need to trace rays in order to
guarantee enough rays going through the slit or getting close enough
to the strand of hair.

Also keep in mind the (amount of work):(amount it affects an image)
ratio.  ;-)

-Nathan

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