what is the use of Projector
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A projector is an output device that projects an image onto a large surface, such as a white screen or wall.
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A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. most projectors create an image by shining a light through a small transparent lena, but some types of projectors can project the image directly, by using lasers.
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