Yes the first or front face mirror is available but expensive. It also isn't
truly front - as a protective layer of something is used to keep the airborne chlorine
and salts from eating up the Al.

Telescope mirrors are front face - have to be - and are replaced periodically due to the
chloride issue. That is when the comet catcher sees a field of stuff that doesn't move :-)


Martin

Martin Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder



jim rozen wrote:
In article , Martin H. Eastburn
says...

I agree mirrors are sputtered Aluminum or sheet silver or my gaudy sheet gold
:-)
The glass is typically, not always by any means a safety glass with an index of
refraction
and absorbs producing defects.



The best mirrors are so-called "first surface" mirrors, where there is
no glass between the incoming and outgoing waves. The metal is on
the *front* of the glass.

A close inspection of the average bathroom mirror shows *two* images - one
from the indident wave being reflected off the interface between the
glass and the air, and the stronger one from the metal to the glass interface.
Very annoying.

After accidentally smashing my truck side-view mirror, I found that it
was indeed first surface - and the one the glass folks tried to install
was not. The replacment performed poorly.

Jim



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