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Double-Image Lens Geometry Derived

Einstein's notebook analysis showed that gravitational deflection could allow light from one distant source to reach an observer along two paths, producing two apparent images.

Albert Einstein lecturing in Vienna in 1921
Albert Einstein lecturing in Vienna, 1921. Photograph by Ferdinand Schmutzer — public domain. Wikimedia Commons source.
Year 1912BerlinAstronomy

Double-Image Lens Geometry Derived

1912 · Berlin · Germany · Astronomy

Einstein's notebook analysis showed that gravitational deflection could allow light from one distant source to reach an observer along two paths, producing two apparent images.

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