Overhead Projectors Price Comparison
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Overhead Projectors price comparison UK
Type of slide projector that is used to display images to an audience. An overhead projector typically consists of a large box containing a very bright lamp and a fan to cool it. On top of the box is a large fresnel lens that collimates the light. Above the box, typically on a long arm, is a mirror and lens that focusses and redirects the light forward instead of up.