What did Gabriel Lippmann win the Nobel Prize for?

Gabriel Lippmann won the Nobel Prize in Physics in 1908 "for his method of reproducing colors photographically based on the phenomenon of interference." Lippmann's method, known as the Lippmann process, involved creating a photographic plate with a layer of light-sensitive silver halide crystals coated on a glass substrate. When light strikes the plate, the light waves create standing waves within the silver halide layer. These standing waves affect the way the silver halides are reduced to silver, resulting in a photographic image that reflects the original colors of the scene. Lippmann's process was one of the first methods for producing color photographs, and it was widely used until the development of modern color film.