Abstract
Demonstration of the diffraction patterns from the two-dimensional Bravais lattice has been studied by use of the two single line lattice grating sheets and a laser pointer. A variable two-dimensional lattice grating was prepared using two grating sheets which are closely attached to each other. The five types of two-dimensional Bravais lattices can be produced by adjusting the relative angle between two single line lattices. The light diffraction patterns from the two-dimensional Bravais lattices indicate the reciprocal lattices of these basic two-dimensional lattice structures.
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