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Laser printer:
A printer that uses a laser beam to project characters and graphics onto a drum, which then electrographically transfers the image onto paper. Laser printers are known for their high quality reproduction and printing speed.
LCD:
Liquid Crystal Display. LCDs are commonly used in calculators, watches, digital cameras and monitors.
LCD monitors works by blocking light. By sandwiching a solution of TN liquid crystals between two perpendicularly aligned panes of polarized glass, it becomes possible to manipulate the intensity of light as it passes through this crystalline matrix and out the glass panel at the other end.
Depending on the voltage of the electrical charge running through them, liquid crystals will untwist so that the intensity of light able to pass through the second polarized pane is affected. Basically, these displays can switch between light states (where liquid crystals are fully twisted) and dark states (where liquid crystals are fully untwisted), or somewhere along the grey scale in between.
LED:
Light Emitting Diode is a semiconductor light source. It is used as indicator lamp in many electrical devices.
LED Printer:
As opposed to laser printer, the printed image is not bought on to a drum by a laser beam, but by a row of densely located light diodes.
Lens:
Transparent glass or plastic that has been formed and polished to form a certain shape, usually spherical. When a beam of light reaches the area between the air and the lens, a part of this light is always reflected. The remaining light passes into the lens (depends on the transparency) and alters its propagation direction, i.e. the light is refracted. The incorporation of various lenses (converging and diverging lens) creates a lens system. When optimally arranged, they allow the subject to be presented correctly on the image plane.
Lens System:
Group of lenses that enable the sharpest and brightest pictures to be taken. Often simply referred to as the lens or objective. There are various lenses available such as wide-angle, normal, macro, and tele with fixed focal distances as well as zoom lenses with adjustable focal distances.
Light Intensity:
01. Relationship of the maximum diameter of an object to its focal distance. It is equal to the smallest aperture value (i.e. the largest opening). Whereas the zoom lenses on analog cameras have a light intensity of F4, good digital camera have lenses with a value of F2.
02. The light intensity from sources of light measured in Candela (cd).
Lens meter:
To ensure correct exposure, most analog and digital cameras feature automatic light metering.
Lithium battery:
An accumulator type battery with a high energy density making it ideal for mobile phones, still and video cameras. Generally, the lithium battery is the main battery and the lithium ion battery is a secondary rechargeable battery.
LPI:
Lines per inch is a unit of measurement of printing resolution in systems that use a halftone screen. Specially, it is a measure of how close together the lines in a halftone grid are. LPI indicates greater detail and sharpness.
Lycos:
A well-known internet search engine and web portal established in 1994.
LZW:
Developed by Lempel, Zif and Welsh; a special kind of compression reducing required storage capacity for Bitmap formats without loss in quality.
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