What is true about rays that are divergent from a source?

Rays that are divergent from a source indeed have negative vergence. Vergence is a measure of how much light rays converge or diverge as they travel; it is expressed in diopters (D). If rays are diverging from a point source, they are spreading out and moving away from a common point. The vergence of these rays is considered negative because they do not converge to a focal point; instead, they move apart.

In contrast, positive vergence refers to rays that converge towards a focal point, while zero vergence would indicate that the rays are parallel and not converging or diverging. The statement that rays are always parallel is also misleading, as divergent rays start from a point and spread out rather than maintaining parallelism.

Understanding the nature of divergent rays is fundamental in optics, especially when dealing with lenses, prescriptions, and designing optical systems. This is why identifying that divergent rays have negative vergence is key when analyzing optical phenomena.