Re: [ATM] You Are a Smart Person...

["Bob May" <rmay@nethere.com>]

>From Richard S./
You are a smart person.   Be creative.   Test under water or in
an oil bath that reduces >the index ratio at the key surface.
But I still think it is poor practice to test a reflecting
>surface by refraction.

Richard, the thing here is that you need to increase the
difference in the index of refraction.  Using some liquid only
makes things worse un5til you get to the same value as that of
the glass where the surface becomes perfectly transparent and
won't refract the light any.  At that point, the test would
indicate a null as being at a parabola which is definitely not
desired.  Rememb That means that when you get to the equal index
for the oil and glass, e=1.er that it is e = n'/n!

Bob May
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