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optical art
optical brightener
optical character reader
optical character recognition
optical computer
optical disk
optical double star
optical fiber
optical glass
optical illusion
optical isomerism
optical mouse
optical rotation
optical scanner
optical semiconductor
optical sound
optical tweezers
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optic axis
op·tic ax·is (plural op·tic ax·es)


noun 
Definition:
 
line going through lens: a line passing through a lens, a curved mirror, or a crystal along which light can travel without undergoing double refraction
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