腔内介质的微扰 或处于法向 0H=1 于是 AD∵ (EgEo Eo+Ho Ho. Ho )dv (35 22b)或 亦处于法向 于是 (35- 22b)   H与H0 0 r H 0 H0   = ( )          − = − −        + −                 +    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1   1       E E H H dv E E H H dv V V * * * *   一、腔内介质的微扰