Assertion: microscope's lens | /r/CapableOf | operate with air
Facets:
value: as the imaging medium
type: MANNER
Source sentences:
text: The sin of the angle m , therefore, has a maximum value of 1.0 (sin(90°) = 1), which is the theoretical maximum numerical aperture of a lens operating with air as the imaging medium (using "dry" microscope objectives).