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  • Article - 28 Jan 2008
    A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.
  • Article - 7 Jun 2013
    A periscope can be defined as an optical instrument that allows the viewing of objects that are not in the direct life of vision. Periscopes prove to be of great help to submariners to have a view of...
  • Article - 13 May 2013
    Xenon chloride (XeCl) excimer laser consists of xenon, a noble gas, and chlorine, a halogen, combined to act as a lasing medium.