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in immersion microscopy, use of a fluid, such as oil, that has a refractive index virtually identical to that of glass, providing the highest possible numerical aperture.
Farlex Partner Medical Dictionary © Farlex 2012
Immersion in which the stratum of air between objective and cover glass is replaced by a medium that deflects as little as possible the rays of light passing through the cover glass.
See also: immersion
Medical Dictionary, © 2009 Farlex and Partners