class_docstr: Represents an optical medium for which the permittivity and permeability are known.
  
  This class should never be instantiated directly. Instead it should be
  instantiated indirectly by instantiating Medium with any two of
  permittivity, permeability, and n specified, or by not specifying any
  of permittivity, permeability, or n, in which case default values for
  permittivity and permeability will be used.
  
  Examples
  ========
  >>> from sympy.physics.optics import Medium
  >>> from sympy.abc import epsilon, mu
  >>> m1 = Medium('m1', permittivity=epsilon, permeability=mu)
  >>> m1
  MediumPP(Str('m1'), epsilon, mu)
  >>> m2 = Medium('m2')
  >>> m2
  MediumPP(Str('m2'), 625000*ampere**2*second**4/(22468879468420441*pi*kilogram*meter**3), pi*kilogram*meter/(2500000*ampere**2*second**2))
docstr: Returns intrinsic impedance of the medium.
  
  Explanation
  ===========
  
  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)
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code: def intrinsic_impedance(self):
      """
      Returns intrinsic impedance of the medium.
  
      Explanation
      ===========
  
      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)
  
      """
      return sqrt(self.permeability / self.permittivity)
  
imports: from sympy.physics.units import second, meter, kilogram, ampere
  from sympy.core.basic import Basic
  from sympy.core.symbol import Str
  from sympy.core.sympify import _sympify
  from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.physics.units import speed_of_light, u0, e0
label_desc: Use image node_id 2 for calling the MediumPP obj's underlying member method code with example usage: obj.intrinsic_impedance() and returns: sqrt