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Re: glass ...



You are right Jim about the fact that the uncertainty in the position of
the angle at which the minimum deviation occurs does not contribute to
the uncertainty of delta. The method can be as accurate as the one based
on the direct application of Snell's law (where differences between TET1
and TET2 are often a little less than delta from two refractions). In
fact if delta=2*(TET1-TET2) then the minimum deviation method will be
two times as precise as the direct method, provided the same "protractor"
is used. I was not aware of this.
Ludwik