Assertion: microscope's objective | /r/HasProperty | changed
Facets:
value: by rotating a nosepiece
type: MANNER
Source sentences:
text: The lower lens or objective can be changed by rotating a nosepiece that holds three or four objectives, each of which has a lens with different magnification.
text: Each time an objective is changed, a corresponding adjustment must be performed on the substage condenser to provide the proper light cone for the numerical aperture of the new objective.