File:Neumann, Franz Ernst – Vorlesungen über theoretische Optik, 1885 – BEIC 6555797.jpg
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![File:Neumann, Franz Ernst – Vorlesungen über theoretische Optik, 1885 – BEIC 6555797.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a3/Neumann%2C_Franz_Ernst_%E2%80%93_Vorlesungen_%C3%BCber_theoretische_Optik%2C_1885_%E2%80%93_BEIC_6555797.jpg/396px-Neumann%2C_Franz_Ernst_%E2%80%93_Vorlesungen_%C3%BCber_theoretische_Optik%2C_1885_%E2%80%93_BEIC_6555797.jpg?20210831081918)
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