From: "Galogaza" 
To: 
Reply-To: "Galogaza" 


Guy,

>Hmm. That is so cool. But is there any problem with the fact that the
>opposite sides of the slide are probably neither flat nor parallel?
>Guy Brandenburg

Yes. There is "any" problem. But it is hopefully negligible and
part of many other
"problems" which we are just neglecting because of their small and unknown
 influence.

flatness and parallelism of slides faces will play role only on the area
covered by the slit. And this is really small one. If the whole slide
(25mm) is uniformly 100 waves not flat (?) slit width area (0.050 mm) is
0.2 waves not flat. Than as usually, source and source image do not
coincide, KE is not
 straight in terms of wavelength there are air currents, source is far from
ideal
( finite width), KE is not exactly  parallel with slit et cetera et cetera.
What matters is if errors of which we are aware  are significant in the
total
error budget. The ongoing discussion initiated by  James Lerch about his
robo Foucault
is seriously exploring one aspect of those problems untouched previously.

Vladimir

--- BBBS/NT v4.01 Flag-4