An object is placed 30 cm away from a symmetric convex lens and an image two thirds of the size of the object is produced. The object is moved by a distance of 20 cm so as to get a magnified image. Now we get 

(a)  a real image of magnification 

(b)  a virtual image of magnification 5 

(c)  a real image at a distance of 40 cm 

(d)  a virtual image at a distance of 60 cm