Assertion: microscope's lens | /r/HasProperty | changed
Facets:
value: by rotating a nosepiece
type: MANNER
Source sentences:
text: During visualization, the objective lens remains parfocal which means, when the objective lens is changed, the image still remains in focus.
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.