A person with bifocal vision has a prescription of -1.75D/+1.50D, which represents the refractive power of the lenses to correct myopia and presbyopia, respectively. each lens acts separately.
A) What is the focal length of each lens?
B) which lens is convergent? how does it correct vision?
C) which lens is divergent? how does it correct vision?
D) If an object is held at 25 cm away, what are the person's near and far points?