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  • lens A transparent optical component consisting of one or more pieces of optical glass with surfaces so curved (usually spherical) that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that...
  • optical glass A glass that, during manufacture, is carefully controlled with respect to composition, melting, heat treatment, and other processing, to render its optical characteristics, such as its index of refraction, dispersion, transmittance, spectral...
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