Re: [ATM] Flexed mirrors

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

Oops.  Reply should have gone to the whole list. Sorry if you
get two of these, Chris.

Christopher Todd wrote:
> In comparing a paraboloidal mirror to a spherical one, am I correct in
> understanding that the sagitta of the paraboloid will be smaller?  That is,
> if you imagined a spherical mirror made of rubber and simply pushed down at
> the edges, you could get a paraboloid?  So when you're figuring a
> paraboloid, you are essentially grinding down the edges more than the
> center? (apologies if this is a poor description, as I said, I've never
> pushed glass)
I think I've actually heard that the "parabolization" is actually
decreasing the inner RoCs, leaving the edge alone.

For flexing, with both push and pull on the mirror, the model I've
used [no confirmation yet] is to fix the RoC at one zone.
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