One end of a long glass rod (n = 1.3) is a convex surface of radius 4.9 cm. An object is located in air along the axis of the rod, at a distance of 10 cm from the convex end. (a) How far apart are the object and the image formed by the glass rod? What is the (b) minimum and (c) maximum distance the object can be placed from the end of the rod in order to produce a virtual image?