Bifocals
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Lens
Binoculars
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Focal length
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Pinhole camera
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Zinedine Zidane
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Corrective lens
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Contact lens
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Ammonoidea
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Joseph von Fraunhofer
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Jellyfish
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Polychaete
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Electrical length
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Scientific Revolution
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Sphere
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Refraction
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Refractive index
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Photolithography
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Photography
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Mirror
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Microscope
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Lighthouse
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Infrared
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Glass
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Electrical engineering
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Euclidean geometry
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Carl Friedrich Gauss
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Buckminster Fuller
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Convex lens
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Concave lens
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