vergency
noun
ver·gen·cy
-nsē,
-si
plural -es
1
obsolete
: the act or process of verging, approaching, or bordering on something : tendency, inclination
2
: a measure of convergence or divergence of a pencil of rays entering or issuing from a lens or mirror that is expressed as the reciprocal of the distance from lens or mirror to the focus of the rays and for rays through a principal focus is equal to the focal power of the lens or mirror
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“Vergency.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vergency. Accessed 22 Nov. 2024.
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