AWhat changed
Magnetizing an iron mirror changes the polarization of light reflected from it. Kerr compared light extinction and the effects of reversing magnetization, changing incidence and rotating the polarizing apparatus. His 1877 and 1878 papers established a family of reflection effects, including changes that cannot be described simply as rotation of a still-linear polarization.
Scientific scope
Magnetizing an iron mirror changes the polarization of light reflected from it. Kerr compared light extinction and the effects of reversing magnetization, changing incidence and rotating the polarizing apparatus. His 1877 and 1878 papers established a family of reflection effects, including changes that cannot be described simply as rotation of a still-linear polarization. The target is the finite experimental magneto-optical reflection contribution, not every magnetic material or the separate 1875 electro-optic Kerr effect. Geometry, surface condition and polarization orientation matter. The first paper rejects an initial explanation that rotation occurs before incidence; a later microscopic theory is not supplied by that discarded model. The source is an explicitly abridged 1900 reprint of the two originals. Faraday is an acknowledged precursor, not a coauthor. The experimenter John Kerr is distinct from relativist Roy Kerr.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The target is the finite experimental magneto-optical reflection contribution, not every magnetic material or the separate 1875 electro-optic Kerr effect. Geometry, surface condition and polarization orientation matter. The first paper rejects an initial explanation that rotation occurs before incidence; a later microscopic theory is not supplied by that discarded model. The source is an explicitly abridged 1900 reprint of the two originals. Faraday is an acknowledged precursor, not a coauthor. The experimenter John Kerr is distinct from relativist Roy Kerr.
Contributors
- The named authors in the research record · SCIENCE: Source-listed authors for the exact contribution; experimental subjects are not autonomous scientific authors. Source support and predecessor work retain separate roles. Individual effort shares and unresolved identities are not inferred.
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