Why do Double-Convex Lenses Act the Way They Do? (2/3)

Hopefully, you predicted the set of prisms would do something like what this converging double-convex lens does to the parallel beams of light. It takes parallel rays of light (left, from Southmoore's ray box) and focus them to a single point. This is called the focal point, and it is where the rays are all intersecting.

Done