[W/K] :: Single microscope

  Microscope \Mi"cro*scope\, n. [Micro- + -scope.]
     An optical instrument, consisting of a lens, or combination
     of lenses, for making an enlarged image of an object which is
     too minute to be viewed by the naked eye.
     [1913 Webster]
  
     Compound microscope, an instrument consisting of a
        combination of lenses such that the image formed by the
        lens or set of lenses nearest the object (called the
        objective) is magnified by another lens called the ocular
        or eyepiece.
  
     Oxyhydrogen microscope, and Solar microscope. See under
        Oxyhydrogen, and Solar.
  
     Simple microscope, or Single microscope, a single convex
        lens used to magnify objects placed in its focus.
        [1913 Webster]