optical glass

American  

noun

Optics.

1. 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.

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optical glass British  

noun

1. any of several types of clear homogeneous glass of known refractive index used in the construction of lenses, etc See optical flint optical crown

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Etymology

Origin of optical glass

First recorded in 1740–50

Example Sentences

This method also does away with the expensive optical glass cover.

From New York Times

About half of the rare earths output are cerium, used for auto catalysts to cut emissions, and lanthanum, used to make optical glass.

From Reuters

The cloudlike forms of “Kumo” are etched by laser into large blocks of optical glass, placed here in front of black backdrops that both set off and reflect the wispy images.

From Washington Post

The valuable things were books and records, surgical instruments and optical glass and such things that a practical working burglar wouldn’t look at twice.

From Literature

In his book, he recalls doing nearly 30 jobs, including underwater filmmaker, optical glass fitter, bar owner, and in-country mechanic for the Royal New Zealand Air Force.

From Los Angeles Times