Question

A patient's far point is 135 cm and her near point is 15.0 cm.

In what follows, we assume that we can model the eye as a simple camera, with a single thin lens forming a real image upon the retina. We also assume that the patient's eyes are identical, with each retina lying 1.95 cm from the eye's "thin lens."

(a)

What is the power, P, of the eye when focused upon the far point? (Enter your answer in diopters.)

diopters

(b)

What is the power, P, of the eye when focused upon the near point? (Enter your answer in diopters.)

diopters

(c)

What power (in diopters) must a contact lens have in order to correct the patient's nearsightedness? (Assume that the object distance is infinite.)

diopters

(d)

Is this contact lens a converging or diverging lens?

converging diverging    

Answer 1