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These are use for geology for mineral thin
section, textile, and forensic sciences for
fiber analysis, etc. Simple polarizing
filters can be added to ordinary
brightfield microscopes.
Although much neglected and undervalued as
an investigative tool, polarized light
microscopy provides all the benefits of
brightfield microscopy and yet offers a
wealth of information, which is simply not
available with any other optical microscopy
technique.
It is illumination technique in which
polarizing filters are above (Analyzer) and
below (Polarizer) the specimen. When there
filters are engaged and crossed a black-out
effect bright against the black
background.
True Polarizing microscopes, are called
petrographic microscopes, will have a
circular rotating stage, a centerable
nosepiece, and a Bertrand lens for
observation of conascopic images
(interference figures).
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