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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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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immersion-objective in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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