On Fri, Dec 23, 2005 at 06:41:12PM +0200, Peter wrote:

> You do not need a front silvered mirror. The double reflexion produced 
> by the usual mirror is not a problem as it is weak (<10%) of the main 
> beam and very close to it (at most sqrt(glass thickness) for angles of 
> +/-45 degrees).

I found an interesting possibility at
http://www.theodoregray.com/PeriodicTableDisplay/Elements/045/index.s7.html

Turns out dental mirrors are front silvered, don't tarnish, and are
extremely hard due to their being coated with Rhodium rather than
silver.

I also know a surplus place where I can get dental mirrors a heck of a
lot cheaper than even standard mirrors.

Testing awaits!

-- 
pete@petertodd.ca http://www.petertodd.ca
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