Permittivity and Permeability affect propagation velocity?

If I understand correctly in refraction, photon absorption and re-emission accounts for light taking "longer" to travel.



Regarding Permeability and Permittivity, the below linked website states:





"permittivity affects the speed of propagation of a wave through a medium"



http://www.antenna-theory.com/defini...rmittivity.php



AND



"permeability also affects the speed of propagation of an electromagnetic wave in a medium"



http://www.antenna-theory.com/defini...rmeability.php







Googling didnt lead me to any supportive information, do the statements make any sense?



Thanks, John

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