Anne is farsighted; the nearest object she can see clearly without corrective lenses is 2.0 m away. It is 1.8 cm from the lens of her eye to the retina.
(a) Sketch a ray diagram to show (qualitatively) what happens when she tries to look at something closer than 2.0 m without corrective lenses.
(b) What should the focal length of her contact lenses be so that she can see clearly objects as close as 20.0 cm from her eye?