geometrical optics

noun

1. 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.

Word History and Origins

Origin of geometrical optics¹

First recorded in 1830–40

Example Sentences

The various elements are carefully designed according to the laws of geometrical optics.

From Project Gutenberg

During his school days he had paid some attention to geometrical optics, and had constructed a microscope and telescope.

From Project Gutenberg