'Returns intrinsic impedance of the medium.
The intrinsic impedance of a medium is the ratio of the
transverse components of the electric and magnetic fields
of the electromagnetic wave travelling in the medium.
In a region with no electrical conductivity it simplifies
to the square root of ratio of magnetic permeability to
electric permittivity.
Examples
>>> from sympy.physics.optics import Medium
>>> m = Medium(\'m\')
>>> m.intrinsic_impedance
149896229*pi*kilogram*meter**2/(1250000*ampere**2*second**3)'

@property
def intrinsic_impedance(self):

    return sqrt((self._permeability / self._permittivity))
