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Long Prisms for homemade spectrometer



Does anybody have a supplier for long 90-degree prisms (say, 1"x1"x12")?

I'm working on making a lab for students to determine the albedo of the moon
by comparing spectra of the sun and moon. As a secondary goal, I have this
thought that the spectra off a reflecting body should be a bit different
than a straight-shot spectra. Is there any truth to this??

I thought I could get clear of the "you'll burn your eyes out!" arguments by
simply projecting the spectra onto a sheet of paper for the students to
marks where the absorption lines were, hence the need for a long prism.

-G-

---------------
Gordon P. Smith
Visiting Assistant Professor of Physics and Astronomy
Hampden-Sydney College
Hampden-Sydney, VA 23943
(804) 223-6177