Just as a double convex lens enlarges so a double concave lens reduces.

正象双凸透镜可以放大那样，双凹透镜也可以缩小。

youdao

Just AS a double convex lens enlarges, so a double concave lens reduces.

正象双凸透镜可以放大那样，双凹透镜也可以缩小。

youdao

Just AS a double convex lens enlarges, so a double concave lens reduces.

正象双凸透镜可以放大那样，双凹透镜也可以缩小。

youdao