Re: [ATM] 40" mirror some ideas

[Jeff Anderson-Lee <jonah@eecs.berkeley.edu>]

Jeff Anderson-Lee wrote:

> If it were in an 81-point cell a 36 by 1/2 inch flat mirror would have 
> roughly 23nm RMS; presumably a slumped mirror of similar diameter 
> would have similar RMS.  Not great, but better than 1/4 wave.  If it 
> was 3/4 inch thick instead, Plop would predict roughly 11nm flex in a 
> 36 inch flat mirror.  At one inch thick, it becomes a quite 
> respectable 6nm RMS.

Oops.  I wrote RMS, but meant P-V.  This relates to the print through 
(sag between the posts).

Jeff

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