oblique illumination
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fo·cal il·lu·mi·na·tion
illumination in which a beam of light is directed diagonally to an object so that it is brilliantly illuminated while the surrounding area is in shadow.
Synonym(s): lateral illumination, oblique illumination
oblique illumination
See illumination.
oblique illumination
Illumination of an object from one side.
See also: illumination