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by Answerbag Staff on February 6th, 2010

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What kind of lens is used in an overhead projector?

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  • by Contributing Writer on February 6th, 2010

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    A Fresnel lens is used in overhead projectors. It is flat on one side, has grooves on the other side, and has the same thickness across the entire length of the lens.

    Source:

    Edmund Optics: Fresnel Lenses

    Top Bits: How Overhead Projectors Work

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