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Precautions while using Overhead Projectors

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An overhead projector is a metal box with mirrors, lenses and a bright light. The bright light from a bulb reflects on the Fresnel lens inside the overhead. The light then bounces to a reflecting mirror under a stage where you set the overhead transparency. This image is in reverse form. A convex mirror then reflects an enlarged image with the proper orientation from the overhead transparency to a screen behind the speaker and the overhead.


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The Use of Overhead Projectors in Education
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Features Overhead Projectors
Overhead projectors
Overhead projectors are more reachable and less costly
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