A concave lens is a lens that is thinner in the center than at the edges, and it causes parallel light rays to diverge, while a convex lens is a lens that is thicker in the center than at the edges, and it causes parallel light rays to converge. Concave lenses are used to correct nearsightedness, while convex lenses are used to correct farsightedness.\n
What is the difference between a concave lens and a convex lens?