At the interface between one linear magnetic material and another, the magnetic field lines bend (Fig. 6.32). Show that \tan \theta_{2} / \tan \theta_{1}=\mu_{2} / \mu_{1}, assuming there is no free current at the boundary. Compare Eq. 4.68.
\tan \theta_{2} / \tan \theta_{1}=\epsilon_{2} / \epsilon_{1} (4.68)