At age forty, a man requires contact lenses (f = 65.0cm) to read a book held 25.0cm from his eyes. At age forty-five, while wearing these contacts he must now hold a book 29.0 cm from his eyes.

(a) By what distance has his near point changed?

(b) What focal length lenses does he require at age forty-five to read a book at 25.0 cm?