direct illumination
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di·rect il·lu·mi·na·tion
an illumination in which the rays of light are directed downward, almost perpendicularly onto the upper surface of the object, which reflects the rays upward into the optical system.
Synonym(s): erect illumination, vertical illumination
Farlex Partner Medical Dictionary © Farlex 2012
direct illumination
The illumination of an object under a microscope by directing light rays upon its upper surface.
See also: illumination
Medical Dictionary, © 2009 Farlex and Partners