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Overhead projector in operation during a classroom lesson. An overhead projector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience.
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 lens, but some newer types of projectors can project the image directly, by using lasers.
Because they use small lamps and the ability to project an image on any flat surface, LCD projectors tend to be smaller and more portable than some other types of projection systems. Even so, the best image quality is found using a blank white, grey, or black [citation needed] (which blocks reflected ambient light) surface, so dedicated ...
At the beginning of the 20th century, projection was split into two classes: "If the light traverses the object, the projection is said to be diascopic, if by reflected light, episcopic." [6] Two main classes of opaque projectors thus existed: the episcope, which solely projected images of opaque objects
The lens adjusted to focus the plane of the slide at the distance of the projection screen, which could be simply a white wall, and it therefore formed an enlarged image of the slide on the screen. [2] Some lanterns, including those of Christiaan Huygens and Jan van Musschenbroek, used three lenses for the objective. [3] [4]
A laser projector is a device that projects changing laser beams on a screen to create a moving image for entertainment or professional use. [1] It consists of a housing that contains lasers, mirrors , galvanometer scanners, and other optical components.
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