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. 

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation:

number of electrons for neutral cl