Definition of hologram

hol´o`gram
n.1.A photographic image giving the observer a seemingly three-dimensional view of the represented object. The three-dimensional effect is produced by exposing a photographic recording medium to an interference pattern generated by a coherent beam of light (as from a laser) reflected from the subject, interacting with a beam directly from the source. The full three-dimensional effect requires illumination of the image with coherent light, but less perfect three-dimensional visual effects may also be observed when the hologram is illuminated with white light.


Related Words

Photostat, Xerox, Xerox copy, blowup, blueprint, contact printing, cyanotype, enlargement, glossy, lantern slide, matte, microcopy, microprint, photocopy, photogravure, photostatic copy, positive, print, projection printing, semi-matte, slide, transparency

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