College Physics 10th Edition by Raymond Serway,Chris Vuille

تمرين 17

A patient can't see objects closer than 40.0 cm and wishes to clearly see objects that are 20.0 cm from his eye. (a) Is the patient nearsighted or farsighted (b) If the eye lens distance is 2.00 cm, what is the minimum object distance p from the lens (c) What image position with respect to the lens will allow the patient to see the object (d) Is the image real or virtual Is the image distance q positive or negative (e) Calculate the required focal length. (f) Find the power of the lens in diopters. (g) If a contact lens is to be prescribed instead, find p , q , and f , and the power of the lens.