Assertion: numerical aperture | /r/DefinedAs | abbe
Facets:
value: for microscope objectives
type: PURPOSE
value: for condensers
type: PURPOSE
value: originally
type: OTHER
Source sentences:
text: Numerical Aperture (also termed Object-Side Aperture) is a value (often symbolized by the abbreviation NA) originally defined by Abbe for microscope objectives and condensers.