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

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

Richard F.L.R. Snashall wrote:

> Mauritz Andersson wrote:
>
>> Richard,
>>
> 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?

Forget all that nonsense... lots of cockpit error in the question!$^&*%

However, if I have finally gotten rid of that, I did have a question 
about the convergence.
If I do make the two radii the same (1374.6) and one of them (the 
reflector in the test)
has a conic constant of  -5.907, the other has (again, if I have done 
this right) a conic
constant of -3.628.  But symmetry would suggest that the conics should 
have the same
conic constant.  What, in your scenario, forces the two to the required 
conic constants?
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