Fig. 19. The amount of divergence of the light is inversely proportional to the distance from the source. If the distance is expressed in meters, the vergence is in units of diopters: 1\Distance in Meters = Diopters. Since A < B, 1\A > 1B . (The light at distance A has more vergence than that at B.) Since C = ∞ , 1\∞ = 0. For example, if we go far enough, the vergence is zero.