photocell
a device that converts the energy in a light ray into electrical energy; also referred to as photoelectric cell.
This reference area is read through red, green, and blue tricolor filtered sensors and finally without filters over the photocell. The analyzer scale is then zeroed for each condition.
This is read using an illuminating light or laser and a photocell or photodiode. In 16 mm, this is a single mono track, and the sound head is 26 frames after the gate.
Made from silicon, CCD sensors hold millions of photocells arranged horizontally in rows and vertically in columns that are sensitive to light.
Passive autofocus cameras use the light falling on photocells to determine the correct focus. When a scene is out of focus, the intensity of light on each adjacent photocell is very similar.
Automatic Flash: An electronic flash that has a photocell which measures the amount of flash illumination reflected back by the subject.
How light or dark a photo appears is determined by your camera's autoexposure system except when you are in manual exposure mode. The autoexposure system uses a light-sensitive photocell to measure the light reflected from the subject and uses the ...
May be this extra will help, photo conductive material used in exposure meters as alternative to selenium-based or silicon blue photocells. Its electrical resistance decreases as the light falling on it increases.
Light operated slaves are triggered when light of a specific wavelength falls upon a photocell in the front of the slave unit, causing the flash to fire.
So the Sun can release nuclear energy, creating light which travels through space to the Earth, where it can be absorbed by, say, a photocell, which in turn permits a motor to run propelling a solar-powered car forward.
 See also: Light, Photograph, Photography, Exposure, Image
  
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