Re: [ATM] ATM chinese puzzler

[Mark Cowan <toolontop@yahoo.com>]

Hi Guy:

My guess would be, he's using a compact led/laser
light source with a ronchi grating to inspect the
mirrors at the center of curvature.  With experience
you can eyeball 1/8th wave correction by moving in and
out of focus and watching the pattern move, seeing
smoothness and zoning.  Since they're producing maybe
1/4 wave at best (well, does anybody really know?)
this would more than suffice.  The guy doing the
testing looks at many mirrors all of the same specs,
it doesn't take data reduction to do this...

Cheers,
Mark Cowan
Salem, OR


--- Guy Brandenburg <gfbrandenburg@yahoo.com> wrote:
> Here is a real optical puzzler for you, sort of like
> the 'Car Talk' puzzlers, only, here I don't know the
> answer. See what you can come up with.

<<snip>>
> There was one man, and only one man, inspecting the
> mirrors. He would walk up and down the length of the
> wall with the mirrors sitting on the pegboards,
> standing about 8 feet away from the wall. This
> inspector had a little device he held in his hand
> that
> looked a bit like a Chinese fan. 
> 

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