Question about index of refraction

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SUMMARY

The index of refraction, represented by the equation n = √(εrμr), is influenced by the wavelength of light, despite the absence of λ in the equation. Both permittivity (εr) and permeability (μr) are wavelength-dependent properties, which means that the index of refraction varies with different wavelengths of light. This relationship is crucial for understanding optical phenomena and materials' behavior at various frequencies.

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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?
 
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The permeability and permittivity will generally depend on wavelength.
 

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