Re: [ATM] Foucault and diffraction

["vladimir sacek" <vlad@copper.net>]

Steve,

>As food for thought, I put a few simulated images in

http://www.atmlist.net/contrib/steve_koehler-at-securecomputing-dot-com/foucault

Thank you, an image is worth a thousand words. What I
realized after my initial post is that what we have in the focal zone
is not a point-source pattern, but the source of light re-imaged in its
original size. Since the source of light normally is not much smaller
than 0.1mm, either for a slit or (especially) a  pinhole, it is still
nearly ten times the diameter of the light cylinder of a point-source form.
This means that the actual form is also nearly ten times wider,
making the bright cylinder of the highest intensity even more pronounced.

I was planning on looking at the recommended programs,
which may help me to make it a bit beyond gross generalizations.
Also, maybe to understand better what is happening when spot-testing.
It is interesting, isn't it: like opening up a toy to find out what's 
inside.
It always results in something: even just a pile of parts that I don't know
what to do with... :)

Vlad 


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