Immersion lens

a microscopic objective of short focal distance designed to work with a drop of liquid, as oil, between the front lens and the slide, so that this lens is practically immersed.

immersion lens

[ə′mər·zhən ‚lenz] (optics) immersion objective

immersion lens

im·mer·sion lens

a microscope objective constructed in such a manner that the lower lens may be moved downward into direct contact with a fluid that is placed on the object being examined; by using a fluid with a refractive index closely similar to that of glass, the loss of light is minimized.

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