In optics, vergence is the angle formed by rays of light that are not perfectly parallel to one another. Rays that move closer to the optical axis as they propagate are said to be converging, while rays that move away from the axis are diverging.
In optics, vergence is the angle created by light rays that are not perfectly aligned. Rays moving closer to the optical axis as they propagate are considered converging, whereas those moving away from it are diverging.