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Answer for the clue "Branch of optics dealing with formation of images by mirrors ", 10 letters:
catoptrics

Word definitions for catoptrics in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Anacamptics \An`a*camp"tics\, n. The science of reflected light, now called catoptrics . The science of reflected sounds. [1913 Webster] ||

WordNet Word definitions in WordNet
n. branch of optics dealing with formation of images by mirrors

Wikipedia Word definitions in Wikipedia
Catoptrics (from katoptrikós , "specular", from katoptron "mirror") deals with the phenomena of reflected light and image-forming optical systems using mirrors . A catoptric system is also called a catopter ( catoptre ).

Wiktionary Word definitions in Wiktionary
n. (plural of catoptric English)