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illumination, Koehler definition
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in reflected-light microscopy, a specular illumination system used directly for the brightfield mode and as preliminary setup for all other modes except darkfield. The image of the field diaphragm is focused on the specimen surface, and the image of an undiffused lamp source is focused in the plane of the aperture diaphragm. [ASTM E7-90]

See also:
inert definition
inductomeric effect definition
induction period definition
initiate motion definition
initial oxide definition
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