File:Optics by Elihu Vedder.png
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![File:Optics by Elihu Vedder.png](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Optics_by_Elihu_Vedder.png/800px-Optics_by_Elihu_Vedder.png?20150327145453)
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