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Re: Glass....



On Wed, 28 May 1997, Larry Smith wrote:

I have a related question. Which glass are the prisms we buy from Edmund,
Cenco, Pasco, Fisher, etc.? The catalogs don't say, nor does any
documentation I can find. I'm looking for the index of refraction of the
prisms in a spectroscope experiment.

Don't you measure the index in the experiment?

Yes, and the value came out between the listed values for crown and flint.


Which spectral line did you use? Is it the same one used for the quoted
values?

Did you take care to set the prism for *minimum* deviation for that
particular spectral line before applying the formula for n? That formula
is only valid for minimum deviation. (But, of course, the students know
that, having derived the formula.)

-- Donald

......................................................................
Dr. Donald E. Simanek Office: 717-893-2079
Prof. of Physics Internet: dsimanek@eagle.lhup.edu
Lock Haven University, Lock Haven, PA. 17745 CIS: 73147,2166
Home page: http://www.lhup.edu/~dsimanek FAX: 717-893-2047
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