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active optics

British

noun

a system to compensate for any deformation caused by gravity in the surface accuracy and alignment of the mirrors of an astronomical telescope by means of actuators that control the movable mirror supports

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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This has left investors with few attractive options, apart from going to cash, to help their portfolios weather this latest storm.

From MarketWatch • Mar. 29, 2026

If, however, compulsion is not the answer some supporters of particular subjects may want to consider if more can be done to make them attractive options which a greater number of students might positively choose.

From BBC • Dec. 27, 2024

You’ll find many attractive options for displaying your plants while providing the light they need.

From Seattle Times • Feb. 7, 2024

The trade market could offer other attractive options.

From Los Angeles Times • Oct. 30, 2023

Flying to Nicaragua is legal, and the rest of the trip is on land - attractive options for Mauritanians and others who want to leave Africa.

From Washington Times • Aug. 19, 2023

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023