The nearpoint of a person is of 35 em. The person is trying to read a book placing it 20 em in front of his eyes. The person needs to decide between purchasing contact lenses or normal glasses. If he decides to purchase contact lenses, what should be the focal length and refractive power of If he decides to purchase normal glasses which will be placed 2 cm in front of the eyes, what should be the focal length and the refractive power of the lens? What type of lens will correct his eye vision?