A farsighted person has a near point that is 48.0 cm from her eyes. She wears eyeglasses that are designed to enable her to read a newspaper held at a distance of 27.0 cm from her eyes. Find the focal length of the eyeglasses, assuming each of the following.
(a) that they are worn 2.0 cm from the eyescm
(b) that they are worn 3.0 cm from the eyes
