object glass vs object lens

object glass and object lens both are nouns.

Word	Noun	Adjective	Verb	Adverb
object glass	Yes	No	No	No
object lens	Yes	No	No	No

As nouns, object glass and object lens are synonyms defined as:

object glass and object lens: the lens or system of lenses in a telescope or microscope that is nearest the object being viewed

Other synonyms of object glass include objective, objective lens.

object glass (noun)	object lens (noun)
the lens or system of lenses in a telescope or microscope that is nearest the object being viewed	the lens or system of lenses in a telescope or microscope that is nearest the object being viewed