Re: [ATM] A two way null test for convex hyperboloids

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

Mauritz Andersson wrote:

>Richard,
>Perhaps I was a bit unclear on the set up. Yes the "lens" is a double convex.
>For example, to test the R1 1374.6 mm surface the light source is
>placed 697.6 mm
>in front of the lens. Then the light pass through the R2 1277mm
>surface, reflects on the R1 1374.6 mm surface, then refracts again
>through the R2 surface and focuses back to where the source is
>located. See figure
>  
>
How long did you consider separating two [20 mm thick] pieces by, say 
177.891 mm
and having them come out the same, 1374.6 mm with conic -5.907?  Two for the
price of one? Why did you reject that as a solution?
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