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Zangger Letter Revisits Gravitational Lensing

Einstein mentioned the possibility of gravitational lensing in a letter to Heinrich Zangger, revisiting the double-image effect he had calculated in his 1912 notebook.

Albert Einstein lecturing in Vienna in 1921
Albert Einstein lecturing in Vienna, 1921. Photograph by Ferdinand Schmutzer — public domain. Wikimedia Commons source.
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Zangger Letter Revisits Gravitational Lensing

15 December 1915 · Berlin · Germany · Astronomy

Einstein mentioned the possibility of gravitational lensing in a letter to Heinrich Zangger, revisiting the double-image effect he had calculated in his 1912 notebook.

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