Definition of active optics 

astronomy

: an optical telescopic system that improves image resolution by compensating for distortions in the material or shape of a mirror Another technological trick called active optics will nullify changes in the telescope’s structure that result from the effects of gravity and temperature.— Thomas Levenson, Discover, February 2006 — compare adaptive optics

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First Known Use of active optics

1968, in the meaning defined above

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The first known use of active optics was in 1968

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