P3D One-sided anti-newton glass (was Re: PHOTO-3D digest 3151)

[Paul Talbot <ptww@xxxxxxxxx>]

Michael Kersenbrock wrote:

> The anti-Newton
> glass has surface irregularities (small to you and me, but large on a
> light-wavelength scale). That keeps the two surfaces apart.  So if the
> glass is anti-newton'ed on only one side, it'll only work one way
> (RBT's glass is this way I recall).

Yes, and what does one do to determine *which* side is anti-newton-ed
after dropping a piece of the glass on the carpet?  It probably
doesn't work like buttered toast where you can count on it landing
a particular way.  ;-)  The two sides seem indistinguishable to
the naked eye.

Paul Talbot


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