Formula_4534

\[\begin{gathered}\tilde{n}(\omega)=\left[\varepsilon_{t}(\omega, q)\right]^{1 / 2}=[\varepsilon(\omega, q) \mu(\omega, q)]^{1 / 2}, \\\cdots \quad q^{2}=\tilde{n}^{2} \omega^{2} / c^{2},\end{gathered}\]