Light : that is visible to the human eye, and is responsible for the sense of sight.
Photograph :image created by light falling on a light-sensitive surface, usually photographic film
Image Sensor : device that converts an optical image into an electronic signal
Aperture :A space through which light passes in an optical or photographic instrument, esp. the variable opening by which light enters a camera.
Shutter :device that allows light to pass for a determined period of time, for the purpose of exposing photographic film
Exposure :he state of being exposed to contact with something
Depth in field :distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image
F-stop :focal length divided by the "effective" aperture
Focal Length: measure of how strongly the system converges or diverges light.
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