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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.


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    [jee-om-i-trish-uh n, jee-uh-mi-] /dʒiˌɒm ɪˈtrɪʃ ən, ˌdʒi ə mɪ-/ noun 1. a person skilled in .

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    noun, Chemistry. 1. each of two or more chemical compounds having the same molecular formula but a different geometric arrangement; an unsaturated compound or ring compound in which rotation around a carbon bond is restricted, as in cis- and trans- configurations. geometric isomer (jē’ə-mět’rĭk) Any of two or more stereoisomers that differ in the arrangement […]

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