Meaning of angle of refraction

an'gle of refrac'tion

Pronunciation: [key]
— Physics, Optics. Physics,Optics.
  1. the angle between a refracted ray and a line drawn normal to the interface between two media at the point of refraction. See diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.