英和和英

語源

From verge (“tend, incline”, from Latin vergere) +‎ -ence, synonym of earlier (1660s) vergency (the equivalent of French vergence). Coined as a technical term in ophthalmology, as a hypernym of convergence and divergence, in 1902. The sense of the numeric quantity in geometric optics was introduced, from use of the term in physiological optics, in the 1920s.

発音

• IPA: /ˈvɜː(ɹ)dʒəns/
• 韻: -ɜː(ɹ)dʒəns

名詞

vergence (countable and uncountable, plural vergences)

1. (physiology) The simultaneous turning of both eyes when focusing. [1902]
2. (optics) A measure of convergence or divergence of rays. [c. 1920]
   • 1921, The Optician and Scientific Instrument Maker, volume 62, page 1:
     • "a special vertex trial case computed for an object vergence of 4.00."
   • 1947 Benjamin King Johnson, Optics and Optical Instruments: An Introduction with Special Reference to Practical Applications, Courier Corporation (1960 [1947]), p. 152.
     • "Ample movement between the source and condenser should be available in order to allow for a variation in the vergence of the light leaving the condenser"
3. (geology) The direction of the overturned component of an asymmetric fold.