Assertion: microscope's objective | /r/ObjectUse | used with oil
Facets:
Source sentences:
text: Objective numerical aperture can be dramatically increased by designing the objective to be used with an immersion medium, such as oil, glycerin, or water.
text: The plan fluor objective on the left has a variable immersion medium/numerical aperture setting that allows the objective to be used with multiple different immersion media, including oil, water, and glycerin.