See Also: optical flat(medicine)
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optical(dictionary)
Optical(medicine)
optical(dictionary)
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optical (as used in expressions)(encyclopedia)
optical aberration(medicine)

optical flat (medicine)


optical flat
<microscopy> Usually, a glass or quartz plate or disk, the thickness of which should be at least 1/10 of its diameter. It is ground until any remaining unevenness can be measured only by interferometric methods. Their maximum departure from flatness usually is less than 1/10 of the sodium doublet (589.3 nm).