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Re: [ATM] WAS Magnalium....


Quoting Mark Holm <mdholm@telerama.com>:

>> a CONCAVE mirror that has
>> precisely the same (but opposite) figure as the convex
>> one that you want. Then you build a monochromatic
>> light source and you use interference testing to see
>> how close the two surfaces are. If the interference
>> fringes are straight
>
>
> But then don't your radii of curvature have to be identical to a 
> pretty fine tolerance, too?
>

Not a problem if the tool is glass/test plate is glass. ;-)

Ken

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