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Excelitas PCO GmbH - Industrial Camera 11-24 VS LB
Photonics Dictionary

Bertrand lens

A small convergent lens, located between the objective and eyepiece of a microscope, that focuses an image of the upper focal plane of the objective in the focal plane of the eyepiece. It is commonly used with polarized light to examine the interference figure, and it is also used to quickly verify an aperture's centering, size and uniform illumination.
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