Grating
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Parallel bars are placed perpendicular to each other to form a grating. You can control the number of bars in each direction, as well as the diameter of bars.
Contributed by: Sándor Kabai (September 2007)
Open content licensed under CC BY-NC-SA
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"Grating"
http://demonstrations.wolfram.com/Grating/
Wolfram Demonstrations Project
Published: September 28 2007