A pyramidal prism/angular cube reflector is always used to reflect a beam of light into the prism, regardless of the direction of the beam. Corner prisms are widely used where accurate alignment is ...
A 4 1/2-inch-high heavy glass pyramid was in a recent house sale. It was inexpensive, but no one knew its purpose. It was almost too heavy to lift, so it wouldn't be a practical paperweight, but we ...
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