object glass

noun

, Optics.

1. objective ( def 3 ).

object glass

noun

1. optics another name for objective

Word History and Origins

Origin of object glass¹

First recorded in 1655–65

Example Sentences

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

From Project Gutenberg

It contains a telescope made by Fitz, whose focal length is seventeen feet, and its object-glass is twelve and a half inches.

From Project Gutenberg

Any errors left over are to be attributed to other causes than the want of collinearity of the axes of object glass and eyepiece.

From Project Gutenberg

Each degree of my scale is equal, however, with the object glass employed, to .002 Mm.

From Project Gutenberg

We therefore proceeded with the experiment, and fixed into the object-glass the little animal, who was struggling in our tweezers.

From Project Gutenberg