What am I missing here? A person looks at a gem using a converging lens with a focal length of 15.0 cm. The lens forms a virtual image 26.0 cm from the lens. Determine the magnification. (1/p)+(1/q) = (1/f) p=? q=26 cm f=15 cm (1/15)-(1/26)= Ans^-1 = 35.5 cm (p) Magnification= -(q/p) M= -(26/35.5) M= -0.733 Answer [-.733] has been marked wrong. What did I do?