[填空题]
A small object is 25.0 cm from a diveg 24a7lr0 z-gp2mig7 1 zahfgirging lens as s3+-5s2bd*f ynbmg btxhown in (Fig. Below). A converging lens with a focal length of 12.0 cm is 30.0 cm to the right of the diverging lens. T-+ m2b ds5tb ngy3bf*xhe two-lens system forms a real inverted image 17.0 cm to the right of the converging lens. What is the focal length of the diverging lens? cm
