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

The refractor achieves this by means of a carefully shaped lens, called the object glass, or objective.

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

This is conveniently done by cutting a large hole, the size of the brass cell of the object glass, through a sheet of corrugated strawboard, and slipping this on over the cell.

From Astronomy: The Science of the Heavenly Bodies by Todd, David Peck

He expressed some surprise at its modest dimensions and fittings generally, but was so well pleased with what he saw that he decided to award them the contract for making the object glass.

From The Reminiscences of an Astronomer by Newcomb, Simon

This is exactly what is done in the telescope; the object glass or large lens forms an image, which is then looked at through a magnifying glass or eye-piece.

From Pioneers of Science by Lodge, Oliver, Sir

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