CAMERA
A camera is an instrument for recording images on photographic film. It consists of a light-tight box wigh a shutter, a lens containing a diaphragam, and a viewing system.
When the shutter is released, the film is exposed to light from the subject that is being photographed. Adjusting the shutter speed alters the time for which the film is exposed to light.
The diagram, by altering the aperture of the lens, controls the intensity of light entering the camera.
The total amount of light entering the camera is called the exposure. The lens focuses the light on to the film. When there is insufficient light to produce an adequate image, a flashgun may be used to give extra light.
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