A man cannot see objects clearly when they are farther than 2.25 m away. (a) Does he have (1) nearsightedness, (2) farsightedness, or (3) astigmatism? Explain. (b) Which type of lens will allow him to see distant objects clearly, and of what power should the lens be (i) if the lenses are worn 2.20 cm from the eyes; (ii) if they are contact lenses.