A lens in which parallel rays cross at a single point on the opposite side is called a:

1. Lenses are named for what they do to parallel light. 2. Rays entering a lens parallel to its axis behave in one of two ways. 3. In one case they cross one another at a single point on the opposite side. 4. That converging effect gives the converging or convex lens its name. _Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 25 'Geometric Optics', sections 25.1-25.7_