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A '''fresnel lens''' is a type of lens that is thinner than a typical lens by using slanted ridges.
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[[File:Creating a fresnel lens.png|thumb|right|Collapsing a conventional lens into an equivalent power Fresnel lens. (Image: Davis and Kühnlenz, 2007)]]
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A '''fresnel lens''' is a type of lens that uses ridges to make it thinner than a typical lens.