Ordinary glasses are worn in front of the eye and usually 2. 0 cm in front of the eyeball. Suppose that a nearsighted person with a far point of 120 cm uses ordinary glasses to correct her vision of faraway objects.

Zachary has been trying to work on an essay for almost three hours, be he can't seem to focus for more than 15 or 20 minutes at a time. what should he do so that the quality of his work doesnt suffer because of poor concentration and lack of energy