A man is unable to focus on objects nearer than 1.5 m.
(a) Does he have (1) nearsightedness, (2) farsightedness, or (3) astigmatism? Explain.
(b) The type of contact lenses that allows him to focus on the print of a book held 25 cm from his eyes should be (1) converging, (2) diverging, (3) flat. Explain.
(c) What should be the power of the lenses?