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Einstein Ring Condition Described

Einstein showed that exact alignment of source, lens and observer produces a circular image geometry, the configuration later widely known as an Einstein ring.

Albert Einstein in a 1912 portrait
Albert Einstein, 1912. Photograph by J. F. Langhans — public domain. Wikimedia Commons source.
Year 1936PrincetonAstronomy

Einstein Ring Condition Described

1936 · Princeton · United States of America · Astronomy

Einstein showed that exact alignment of source, lens and observer produces a circular image geometry, the configuration later widely known as an Einstein ring.