PURPOSE: Two dimensional diffraction patterns with crystal symmetries.
DESCRIPTION: These optical crystals consist of simple arrays of various shaped diffraction centers arranged with several two dimensional symmetries. Diffraction by such a crystal produces a pattern with the symmetry of the scattering slide. Wi nner of the 1973 AAPT apparatus competition.
REFERENCES: (PIRA 6D20.57)
EQUIPMENT: Laser cart with optical crystals.
SETUP TIME: None.
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