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Projector is a device for transferring photographic and other images in an enlarged form onto a viewing screen. All types of projectors employ a light source and a lens system. A simple still-photo or slide projector for exhibiting transparencies has two sets of lenses, one between the light source and the transparency, to concentrate the light, and one in front of the transparency. An LCD projector can light up your teaching life. It is a portable device and is also called as overhead projector. A projector is commonly used for slide shows, presentations, multimedia and as a home theatre.
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