camera obscura

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camera obscura

a darkened chamber or small building in which images of outside objects are projected onto a flat surface by a convex lens in an aperture
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

camera obscura

[¦kam·rə əb′skyu̇r·ə]
(optics)
A primitive camera in which the real image of an object can be observed or traced on the wall of the enclosure opposite the aperture, rather than being recorded photographically.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.