A measurement indicates that a patient cannot clearly see any object that lies closer than 64.8 cm to the patient's eye.

(A)The patient needs to be able to clearly see objects that are just 27.0 cm distant. A contact lens is made to order. What focal length (in cm) should this lens have? Assume the lens can be modeled as an ideal thin lens, which lies adjacent to the eye.

(B)What is the power, P, of the contact lens (in diopters)?