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

Word History

Etymology

verge entry 3 + -ency

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