How are holograms possible? | Optics puzzles 5

Holograms create a 3D illusion using a piece of film exposed to a laser in a special way. This process stores various light details of a scene, from different viewing angles to optical effects like reflections and refractions. Real-world holograms operate differently from the sci-fi representations often seen in movies. They rely on a principle discovered in 1947 by Dennis Gabor, which became practical with the invention of lasers. The post delves into how these holograms are recorded and reconstructed, including technical nuances like phase, interference patterns, and the use of diffraction gratings.