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Optical engineers may work in any of the many subfields or related branches of optics. Three of the largest areas are physical optics, which is concerned with the wave properties of light; quantum optics, which studies photons, or individual particles of light; and geometrical optics, which involves optical instruments used to detect and measure light. Other subfields of optics include integrated optics, nonlinear optics, electron optics, magneto-optics, and space optics.