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Terms
  • crystal A solid with a structure that exhibits a basically symmetrical and geometrical arrangement. A crystal may already possess this structure, or it may acquire it through mechanical means. More than 50 chemical substances are important to the optical...
  • ultraviolet (UV) That invisible region of the spectrum just beyond the violet end of the visible region. Wavelengths range from 1 to 400 nm.
  • cement An adhesive used for bonding optical elements or for holding devices.
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