How does a lighthouse's fresnel lens work?

Lighthouses use beams of light projected through a special lens called a Fresnel lens. Invented by a Frenchman in the early 1800s, the Fresnel lens concentrates beams of light through a prismatic...

a lens works when light goes through it and refracts (bends) inside the lens. so the light basically refracts inside the lens.

with a light

Fresnel

Lighthouses are usually operated by the government. Whether it is a local or national government depends on the country. Some lighthouses are also privately owned.