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Updated: May 11, 2025
The career of electromagnetic processes in vacuo appears to be completely determined by these equations, uninfluenced by other physical quantities. The electromagnetic fields appear as ultimate, irreducible realities, and at first it seems superfluous to postulate a homogeneous, isotropic ether-medium, and to envisage electromagnetic fields as states of this medium.
Brewster found the specimens which he examined to be perfectly isotropic, exercising no influence in depolarizing light. When heated, however, it proved to be remarkably phosphorescent. The translucent varieties were found to transmit a yellowish and to reflect a bluish white light or, in other words, to exhibit the phenomenon of opalescence.
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