The directions can be obtained by removing the quarter-wave plate and following the procedure for plane polarized light or by interpolation. 可将四分之一波片卸去，并按平面偏振光法或内插法来决定其主应力方向。
The band width limitation for a multistage waveplate is defined as the allowable wavelength range of waveplates under some restrained conditions. 本文所述带宽容限是对多级波片而言，即在某些限定条件下，波片允许的波长取值范围。
