Q. A magnifying glass is a single convex lens with a focal length of f = +13.0 cm.
a) what is the angular magnification when this lens forms a (virtual) image at infinity? Imagine that the person's near point is 25cm.
b) How far from the object should the lens be held?
c) What is the angular magnification while this lens forms a (virtual) image at the person's near point (assumed to be 25.0 cm)?
d) How far from the object must the lens be held in this case?