A Simple Digital Camera Lens with Focal Length $f _ { o } = 3.00 \mathrm {~cm}$

A simple digital camera lens with focal length $f _ { o } = 3.00 \mathrm {~cm}$ perfectly focuses the image of an object on a CCD sensor located a distance $14.00 \mathrm {~cm}$ away from the lens. The object now moves away from the lens and the new distance between the lens and sensor is $13.00 \mathrm {~cm} \text {. }$ (a) By what amount did the object change its distance from the lens? (b) What is the new magnification?

A) (a) 0.08 cm (b) 3.33
B) (a) 0.03 cm (b) 0.30
C) (a) 990.00 cm (b) 0.23
D) (a) 12.22 cm (b) 4.33