Definition of "vergence" in Anglais

noun

1. (physiology) The simultaneous turning of both eyes when focusing.

2. (optics) A measure of convergence or divergence of rays.

   • 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.