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

Both lenses have their convex surfaces toward the object glass, and their distance apart is equal to half the sum of their focal lengths.

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

See Prism, Ð Achromatic telescope, or microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color.

From Webster's Unabridged Dictionary by Webster, Noah

In answering him I called his attention to the ability of Alvan Clark & Sons to make at least the object glass, the most delicate and difficult part of the instrument.

From The Reminiscences of an Astronomer by Newcomb, Simon

B. Astigmatism is detected by rotating the object glass or object glass cell.

From On Laboratory Arts by Threlfall, Richard

Thoma's Haemacytometer consists of an object glass with carefully constructed cell, a ground absolutely plane coverglass and two pipettes for mixing the blood and saline solution used in the examinations.

From Microscopes and Accessory Apparatus Catalogue No. 40 by Leitz, Ernst