A magnifying glass is a single convex lens with a focal length of f = +11.1 cm. What is the angular magnification when this lens forms a virtual

A magnifying glass is a single convex lens with a focal length of f = +11.1 cm. What is the angular magnification when this lens forms a virtual image at - infinity? Assume that the person's near point is 25.0 cm. B)How far from the object should th lens be heldC)What is the angular magnification when this lens forms a virtual image at the person's near point (assumed to b 25.0 cm)D)How far from the object should the lens be held in this case.