What design is characterized by a central point and concentric ridges with a prism effect?

The Fresnel lens is characterized by its unique design that features a central point with concentric ridges. This design helps create a prism effect, which allows the lens to bend light more effectively than a traditional lens of the same thickness. The ridges reduce the amount of material needed while still maintaining the optical properties required for focusing light. This makes the Fresnel lens lightweight and suitable for use in applications such as magnifiers, lighthouses, and various optical devices. Its ability to manipulate light effectively through the concentric ridges is key to its functionality, making it distinct from the other lens types listed.