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optical glass

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optical glass

–noun Optics.
any of several types of high-quality, homogeneous, color-free glass, as flint or crown glass, having specified refractive properties, used in lenses and other components of optical systems.

Origin:
1740–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: optical glass
Function: noun
: flint or crown glass of well-defined characteristics used especially for making lenses
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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