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. 

what best describes physical development during adolescence is the development of secondary sex characteristics happens at a rate unique to each individual.

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)