• A three-dimensional image which is recorded on a suitable medium such as a high resolution photographic plate. The recording medium stores an interference pattern which is formed by a coherent beam of light reflected by a reference mirror, and by light scattered by the object being photographed. A laser usually serves as the source of the coherent light. When suitably illuminated, it produces a three-dimensional image in space. A hologram may be incorporated into a credit card, for instance, as a measure to help prevent fraud. acoustic or radio waves may also be utilized to create a hologram.

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