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An assembly of optically refracting or reflecting elements (or both) and their supporting frames. | An assembly of optically refracting or reflecting elements (or both) and their supporting frames. | ||
Latest revision as of 09:23, 17 September 2026
An assembly of optically refracting or reflecting elements (or both) and their supporting frames.
Through the agency of these elements, rays emitted by a light source are deflected into new directions as required.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
