immersion objective

American  

noun

Optics.

1. 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.

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Example Sentences

Let r represent the silvered surface of the glass disk, b, the immersion objective, f, the thin glass cover.

From Scientific American Supplement, No. 447, July 26, 1884 by Various

With the oil immersion objective, however, an achromatic condenser, giving an illuminating cone of about 0.9, should be used if the full value of the lens is to be obtained.

From The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. by Eyre, J. W. H. (John William Henry)