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Mar 10, 2015 at 21:05 comment added Canis Lupus +1 Optical Element: A part of an optical instrument which acts upon the light passing through the instrument, such as a lens, prism, or mirror.
Mar 10, 2015 at 20:31 history edited Nick2253 CC BY-SA 3.0
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Mar 10, 2015 at 19:05 comment added amdn @Nick2253 feel free to use optical element instead of optical device as used in the Wikipedia page I pointed out in the comments.
Mar 10, 2015 at 18:19 comment added Edwin Ashworth Not very good, as this cuts across general usage (a telescope being an optical device).
Mar 10, 2015 at 16:11 history answered Nick2253 CC BY-SA 3.0