From: "Richard F.L.R. Snashall" 
To: Mike and Sara 
CC: ATM 
Reply-To: "Richard F.L.R. Snashall" 




Mike and Sara wrote:
> Hello!
>
>
>
>     Since each fringe reflects a differnce between the surfaces of exactly
> lamba/2, could a picture be taken of the pattern, blown up to say 8x10, and

Not quite true.  The fringe difference reflects a difference between the
light paths of exactly lambda/2.  For a spherical surface (as opposed to
flat), in the center the incidence is normal, but near the edges, there
will be some refraction.  It will depend upon the actual separation of the
surfaces as well.

                Rick S.

> the spacing between fringes measured?  They could be plotted to see if the
> pattern is spherical, paraboloid, ellipsoid, or hyperboloid?  In this way,
> each fringe would act like the shadow of a coude mask.  Can Tex be modified
> in some way to handle this situation or would the spacing need to be plotted
> by hand and the curve calculated by hand?
>
>     Thanks for your help.  Best regards.
>
> Mike
>
>
>

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