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## Homework Statement

For a plane em wave in vacuum can write [tex]k=\frac{w}{c}[/tex]

what is the equivalent relation in a dielectric?

## Homework Equations

[tex]\frac{1}{c^2}={\epsilon}{\mu}[/tex]

## The Attempt at a Solution

[tex] k=\sqrt{{\epsilon_{r}}\epsilon\mu}.w[/tex]

This right?

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