Magnetic permeability and optical impedance

[duchuy]

Homework Statement

Determine the value of optical impedance

Relevant Equations

Z = μ . c/n

Hi,
It's given that an electromagnetic wave (5.10^14 Hz) traveling in an environment with the index n = 1,33, where the magnetic permeability (μ) is equal to the magnetic permeability in a vacuum (μ0).
The optical impedance (Z) is given by the formula : Z = μ . c/n.
I tried to turn μ into μ0 to determine its value but I didn't manage to get any further than determining the value of the relative electrical permittivity (εr) = 1,769.
Sorry if I have misused any vocabulary because I'm translating this from french.
Thank you so much for your help!

 

[Steve4Physics]

I tried to turn μ into μ0 to determine its value but I didn't manage to get any further than determining the

That doesn't make sense, but it might be a language problem.

What is the magnetic permeability of a vacuum (μ0)? Look up this standard value if you don't already know it.

the magnetic permeability (μ) is equal to the magnetic permeability in a vacuum (μ0).

So, you now know how big the magnetic permeability (μ) is.

Since you know μ, c and n you can now work out Z using your formula. I don't see the problem.