Question about index of refraction

physics user1
according to wikiedia i can express the index as n= √(εrμr)
but i also know that the index of refraction depends of the wavelenght but i don't see any λ in the equation, so ... why?
 
Last edited by a moderator:
on Phys.org
The permeability and permittivity will generally depend on wavelength.
 

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