谐振腔一端为平面反射镜,一端为金属栅网。
The image and material object of plane mirror are simultaneously photographed on negative.把平面镜的映像和实物同时拍摄成底片。
This is certainly true for a plane mirror but it is only approximately the case for other configurations.对于平面镜这肯定是对的,但是对于其它形状的反射镜则情况只是近似如此。