Bertrand lens

Bertrand lens

[′ber‚tränd ‚lenz]
(optics)
An auxiliary lens that can be inserted in the tube of a polarizing microscope to obtain interference figures.
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The optimal polarized-light microscope system includes a strong light source, a Bertrand lens, proper working distance objectives, and polarizer/analyzer.
The focusable Bertrand lens placed on the stand is linked to the analyzer, allowing operating convenience and error-free use.