immersion-lens

immersion objective

noun Optics.
a microscope objective of high resolving power in which the space between the front lens and the cover glass is filled with an oil whose index of refraction is close to that of the objective and the cover glass.
Also called immersion lens, oil-immersion objective.
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Medical Dictionary

immersion objective n.
A high-powered objective used with a liquid between the lens and the specimen on the slide.

The American Heritage® Stedman's Medical Dictionary
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