Etymology
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optics (n.)

"science of sight and the natural properties of light," 1570s, from optic; also see -ics. Used for Medieval Latin optica (neuter plural), from Greek ta optika "optical matters," neuter plural of optikos "optic."

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Definitions of optics

optics (n.)
the branch of physics that studies the physical properties of light;
optics (n.)
optical properties;
the optics of a telescope
From wordnet.princeton.edu