A magnifying glass is a single convex lens with a focal point length of f= + 14 cm. What is the angular magnification when this lens forms a (virtual) image at - 8
a) How far from the object should the lens be held?
b) what is the angular magnification when this lens forms a (virtual) image at the person's near point ( assumed to be 25 cm)? How far from the object should the lens be held in this case?