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Fresnel Lens in Lighthouse |
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| The Fresnel lenses in this lighthouse tower are each a collection of multiple glass prisms that bend nearly all available light into a powerful central magnifying lens. Each central lens points in a different direction and can project light beams visible up to 45 km (28 mi) away. | ||||||
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| Ric Ergenbright/Corbis | ||||||
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| Appears in these articles: | ||||||
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| Fresnel, Augustin Jean; Optics; Lighthouse | ||||||
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