[填空题]
A diverging lens with pvvzzut9ep 2j(za-r iacng8- y.5 9:h 6g+9 hvw0*p+twvie 6h5 ,ngippwpng*$f=-31.5\mathrm{~cm}$ is placed 14.0 cm behind a converging lens with $f=20.0\mathrm{~cm.}$ Where will an object at infinity be focused? , cm beyond second lens.
