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Mini-Monster Prism
Optical grade prism from Uncle's WWII tank periscopes. This one is 2-1/8" on the hypotenuse, 5-3/4" long, and 1-1/2" on the leg. They may have small non-interfering chips or surface scratches. These military tank prisms will be gone one day soon. That will be sad. In the meantime, get the unsilvered version, they make great rainbows.
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3538 MINI-MONSTER PRISM |
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A Pyramid of Prisms
Polished glass equilateral prisms. Equilateral because each edge of the end is the same length, 25mm. Thus, as all you geometry students know, each of the angles is also the same, 60 degrees. These are school grade and are fine for decorative and demonstration. They do a nice job of diffracting light to produce a nice rainbow-like spectrum, but are definitely not up to instrumentation standards. The missing dimension, length, is shown below.
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31801 PRISM, 2" | |
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31798 PRISM, 4" | |
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31799 PRISM, 6" | |
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31797 PRISM,3" |
Be(prism)am
Nice little cubic beamsplitter prism. (Get it?) 12 x 11 x 10mm, it's painted black on (3) sides. Low transmission-about 70/30 or 80/20-but it'll be fine for classroom demos, experimentation, or perhaps souping up your fancy laser device.
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42819 BEAM SPLITTER PRISM |
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 |
Bend It Like Newton
…with this clear-acrylic triangular prism, 25mm x 50mm long (1" x 1-15/16"). Perfect for light refraction lessons--especially for younger kids, since the plastic won't chip like glass will--and for showing how Sir Isaac figured out rainbows way ahead of all the other kids.
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92716 ACRYLIC PRISM |
Mini-Prism
Great quality take-outs from a microscope, these prisms are dandy for school demos, lasers, DIY periscopes. They're 45° mirrored heads, 1-3/16" long x 11/16" wide x 1/2" high.
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38056 PRISM |
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