Fresnel lens

A Fresnel lens is a specialized type of lens that uses a series of concentric, shallow rings to focus or direct light, similar to a traditional curved lens but much thinner and lighter. It was designed to capture and magnify light efficiently while reducing bulk and weight, making it ideal for applications like lighthouse beacons, overhead projectors, and headlights. The design allows the lens to achieve a strong focusing ability with significantly less material, maintaining optical performance while being easier to produce and handle.