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\section{Grenzbedingungen}  \begin{equation}  Div \vec{B} := \vec{n_{12}}\cdot(\vec{B_2}-\vec{B_1})=0 \quad\rightarrow\quad B_{tan1}=B_{tan2} B_{norm1}=B_{norm2}  \end{equation}  \begin{equation}  Rot \vec{E}:= \vec{n_{12}}\times(\vec{E_2}-\vec{E_1})=\vec{0}\quad\rightarrow\quad E_{tan1}=E_{tan2}