1. In optics, an aperture is a hole or an opening through which light travels.
2. A device that opens and closes to expose the film in a camera is called a shutter.
3. the action of exposing a photographic film to light or other radiation is called exposure.
4. the distance between the nearest and the furthest objects that give an image judged to be in focus in a camera is the depth of field.
5. F-Stop is a camera setting corresponding to a particular f-number.
6. The distance between the center of a lens or curved mirror and its focus is the focal length.
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