One of your team members lost her glasses in a river. She is nearsighted and cannot see long distances without them. You are on an expedition to map a remote area in southern Argentina, and her long-distance vision is crucial to her role in the group. You can request a new pair of glasses for her that will be delivered with the next airdrop of supplies, but she does not know her lens prescription.

(a) Does she need a converging or diverging lens?

(b) You do a simple eye test and estimate her far point to be 623.0 cm from her eyes. Assuming she will wear her glasses 2.0 cm in front of her eyes, what should be the focal length of her new lenses?

(c) What should be the refractive power of her new lenses (in diopters)?