Wide-Angle Interferences and the Nature of the Elementary Light Sources

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Abstract
It was proved, in connection with the purely theoretical papers by Halpern and Doermann that a wide-angle optical interference phenomenon can be realized only if the light source is two-dimensional with its third dimension of less than 1/10,000 mm. Observations of the author made in 1911 and 1938 with a simple optical arrangement which fulfills this condition have proved that fluorescence light possesses all the properties of the simple dipole radiation.