optics

Optics is a branch of physics that is the study of light and vision.

(noun)

An example of optics is the technology of an astronomical telescope.

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See optics in Webster's New World College Dictionary

noun

the branch of physics dealing with the nature and properties of light and vision

Origin: < optic

See optics in American Heritage Dictionary 4

noun (used with a sing. verb)
The branch of physics that deals with light and vision, chiefly the generation, propagation, and detection of electromagnetic radiation having wavelengths greater than x-rays and shorter than microwaves.

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