Relating to mirrors or reflection; relating to the science of catoptrics, which studies light reflected from mirrors.
From Greek 'katoptron' (mirror) derived from 'kata' (down) + 'optesthai' (to see), literally 'looking down.' The -ical suffix makes it an adjective.
The Greeks understood mirrors so well that they had their own dedicated science for studying them—catoptrics—complete with its own set of laws about how light bounces and reflects.
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