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19 points
CATADIOPTRIC is validvalid
[adj]
relating to or employing both reflection and refraction, as in the construction of some long-focal-length photographic lenses, also CATADIOPTRICAL [adj]
[adj]
relating to or employing both reflection and refraction, as in the construction of some long-focal-length photographic lenses, also CATADIOPTRICAL [adj]