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in cooperation with Albert Wangerin in Halle, whom he knew from the Königsberg Seminar of Physics; Wangerin took the theoretical part, and Sohncke the experimental one. They found errors in the previous concepts on this matter; in contrary to preceding research they took into account the thickness of the plane glass and the extension of the source of light. Other cooperation partners in Jena were Ernst Abbe and Siegfried Czapski

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