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Oxidation and the RA Prism
RA means right angle, which in prismese means two 45° and one 90° angle. Oxidation is how glass rusts, and it looks like a powdery white stain that won't rub off. Really doesn't interfere with the optical use of the prism, but it can be annoying. You have two choices. Ignore it and reap the price advantage, or get some of the polishing compound you use on auto windshields, buff off the surface, and reap the price advantage. These seconds have chips and/or surface scratches. Use them as spectroscopic prisms, put two hypotenuse to hypotenuse as beam splitters. All have 1-1/2" legs and 2" hypotenuses. The thickness varies as noted (sizes are approximate), and the silvered ones (sil) have a reflective coating on the hypotenal face while the plain ones (pl) don't. Remember that the silvered ones, which may make better periscopes, don't work for spectral experiments or as beam splitters.
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3530 RA PRISM, 1-1/8" PLAIN | |
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3525 RA PRISM, 1-1/8" SILVERED | |
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4311 RA PRISM, 2-7/8" PLAIN |
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