Refractive index
The refractive index of a material is the factor by which the phase velocity of
electromagnetic radiation is slowed in that material, relative to
its velocity in a vacuum. It is usually given the symbol
n, and defined for a material by:
where
er is the material's relative
permittivity, and
r is its relative permeability.
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Encyclopedia
The
refractive index of a material is the factor by which the phase velocity of
electromagnetic radiation is slowed in that material, relative to
its velocity in a vacuum. It is usually given the symbol
n, and defined for a material by:
where
er is the material's relative
permittivity, and
r is its relative permeability.
