Jean was born 5 Feb 1878 in Paris, France to Antoine Edouard Becquerel and his wife Lucie Zoe Marie Jamin.
Jean Becquerel was also a French physicist like his father and grandfather and great grandfather. He worked on the optical and magnetic properties of crystals discovering the rotation of the plane of polarization by a magnetic field.
In 1909 he became the 4th member of his family to occupy the physics chair at the Museum National d’Histoire Naturelle.
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