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Additional
Medium (optics)
English Wikipedia - The Free Encyclopedia
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Optical medium
An
optical medium
is material through which
electromagnetic waves
propagate. It is a form of
transmission medium
. The
permittivity
and
permeability
of the medium define how electromagnetic waves propagate in it. The medium has an
intrinsic impedance
, given by
where
and
are the
electric field
and
magnetic field
, respectively. In a region with no
electrical conductivity
, the expression simplifies to:
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