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Fresnel Lens is plastic sheet covered with small, narrow, concentric grooves. Fresnel lenses are used as hand-held magnifiers, in stoplights, and more.

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Larger glass Fresnel lenses were initially developed for use in lighthouses. The plastic Fresnel lenses of today are used as hand-held magnifiers, in stoplights, and to focus light into narrow beams. Plastic sheet is covered with small, narrow concentric grooves. 7-1/8" x 10¼".