College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 35

A person with a nearsighted eye has near and far points of 16 cm and 25 cm, respectively. (a) Assuming a lens is placed 2.0 cm from the eye, what power must the lens have to correct this condition (b) Suppose contact lenses placed directly on the cornea are used to correct the person's eyesight. What is the power of the lens required in this case, and what is the new near point Hint: The contact lens and the eyeglass lens require slightly different powers because they are at different distances from the eye.