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principal focus

noun

Optics.

  1. focal point.

principal focus

noun

  1. another name for focal point

“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
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Word History and Origins

Origin of principal focus1

First recorded in 1825–35

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principal diagonalprincipal ideal

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