Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: glass ...

Brian whatcott wrote:

One measures the angle A of the prism, and delta the angle of minimal
deviation for a selected wavelength, and then the refractive index
relative to air ( mu) is given by

mu = sin 1/2 (A + delta)/sin 1/2 A

The trouble with this method is that the minimum is practically flat over
the broad range of angles. Thus a very large uncertainty will always be
associated with delta. I nice mathematical relation, but not very useful
for measuring mu.
Ludwik Kowalski