At what distance from a convex lens must an object be to get a virtual image?

The thing should be at a space less than the focal length from the convex or also known as converging lens in a way to develop a virtual image. The image made would be standing, virtual and enlarged, just like how a magnifying glass does. The virtual image is shaped on the same side of the lens as the object. 

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000