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catoptrics

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
catoptricsĀ 
The branch of optics which deals with reflection and reflectors.


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The Pharos, the lighthouse in ancient Alexandria on top of which an enormous mirror was positioned with which one was able to see enemy ships from far away (and to set them on fire), is perhaps the most familiar incarnation of legendary telescopic catoptrics, but translated in Latin as late as 1575, it was preceded by various medieval versions of the same device.
 
 
 
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