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Advances in optics, as in most branches of science, result from achievements in technology which make possible more refined observations. Although the converse is a bit rarer, advances in optical technology are also achieved by an improved understanding of the nature of light. An outstanding example of this is the invention of holography. Although it represents a form of photography, holography constitutes a distinct departure from the traditional practice of pictorial recording. It achieves this departure by being based upon a knowledge of the constitution of light. It is of interest to review the differences.
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