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geometrical optics

the branch of optics dealing with light as rays, especially in the study of the effects of lenses and mirrors on light beams and of their combination in optical instruments.
Origin of geometrical optics
First recorded in 1830-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for geometrical optics
Historical Examples
  • The various elements are carefully designed according to the laws of geometrical optics.

    Artificial Light M. Luckiesh
  • During his school days he had paid some attention to geometrical optics, and had constructed a microscope and telescope.

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