(Answered) A magnifying glass is a single convex lens with a focal

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"A magnifying glass is a single convex lens with a focal length of f = +11.0 cm. (Assume the person using the magnifying glass has a near point of 25 cm and the magnifying glass is directly in front of the person's eyes.)

(a) What is the angular magnification when this lens forms a (virtual) image at -infinity. (I've done this one. The answer is 2.27. But I can't figure out how to do the others.)

(b) How far from the object should the lens be held?

(d) How far from the object should the lens be held in this case?

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