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In 1845 Faraday observed that
a magnetic field influenced polarized light,
a phenomenon known as the magneto-optical
effect or Faraday effect. He discovered that
the plane of vibration of a beam of linearly
polarized light incident on a portion of
glass rotated when a magnetic field was
applied in the direction of propagation of
the beam. This was one of the first
indications that electromagnetism and light
were connected.
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