Photography is the art, science, and practice of creating durable images by recording light (photons – hence, “photo”-graphy) or other electromagnetic radiation, either chemically by means of a light-sensitive material such as photographic film, or electronically by means of an image sensor. Typically, a lens is used to focus the light reflected or emitted from objects into a real image on the light-sensitive surface inside a camera during a timed exposure.

Reflection (physics)

Xavier Casalta