achromatic prism definition

  • adjective:
    • See Prism.
  • noun:
    • a prism composed generally of two prisms of various transparent substances which may have unequal dispersive abilities, as two different kinds of cup, specifically flint-glass and crown glass, the real difference of dispersive energy being compensated by providing them various refracting angles, making sure that, when placed together so as to have opposite relative roles, a ray of light passed away through them is refracted or bent into a fresh position, but is without shade.
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