A lens that focuses distant light to a single point is known as a

• A. Converging lens
• B. Diverging lens
• C. Plano-convex lens
• D. Concave lens

Answer: (A)

When light from far away is essentially parallel, a lens that makes those parallel rays meet at one point is a converging lens. The convex surfaces bend the incoming parallel rays inward so they cross at a single focal point on the far side. This is exactly how distant light is brought to a sharp point.

A diverging lens (concave) would spread parallel rays apart, so they don’t converge to a real point. A plano-convex lens is just a specific shape of a converging lens, so it shares this same focusing behavior.