Camera obscura- the Latin term meaning "dark chamber"
Visible spectrum- the portion of the electromagnetic spectrum that you can see.
Electromagnetic spectrum- any possible frequencies of electromagnetic radiation.
Camera sensor- takes an optical image to an electric signal.
Aperture- the opening where light travels
Shutter- the time over which light is captured.
Exposure- the total amount of light allowed to fall on the sensor during the taking of a picture.
Depth of Field- the portion of a scene that appears acceptably sharp in the image.
F-stop- the focal length divided by the "effective" aperture diameter.
Focal length- a measure of how strongly the system converges (focuses) or diverges (defocuses) light.
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