Kohler illumination

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Köh·ler il·lu·mi·na·tion

(kō'ler),
a method of illumination of microscopic objects in which the image of the light source is focused on the substage condenser diaphragm and the diaphragm of the light source is focused in the same plane with the object to be observed; maximizes both the brightness and uniformity of the illuminated field.

Köhler,

August, German microscopist, 1866-1948.
Köhler illumination - a method of illumination of microscopic objects.
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