A presbyopic (farsighted) eye has a near point of 100 cm away. What type of lens is needed to permit the eye to see clearly objects 25 cm away, and what focal length should such a lens have An object is placed 3 cm from a lens. The image is found to lie 12 cm from the lens, on the same side as the object What is the focal length f of the lens, and is the image upright or inverted?