object glass

American  

noun

Optics.

1. objective.

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object glass British  

noun

1. optics another name for objective

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Etymology

Origin of object glass

First recorded in 1655–65

Example Sentences

Pulkova Observatory, object glass made by Alvan Clark & Sons, 144,   145; foundation and situation, 309-313.

From The Reminiscences of an Astronomer by Newcomb, Simon

The length of this shadow is easily found by means of a telescope, whose object glass is provided with a micrometer.

From All Around the Moon by Roth, Edward

Curiously the others crowded about the object glass of the periscope.

From Boy Scouts in the North Sea The Mystery of a Sub by Ralphson, G. Harvey (George Harvey)

The object glass is the eye of the instrument—the sensitive paper may be compared to the retina.

From The Pencil of Nature by Talbot, William Henry Fox

Suppose we turn it in such a way that the eyepiece moves slightly outside the focus, or away from the object glass.

From Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers by Serviss, Garrett Putman