Formation of Images by Lenses

A convex lens always forms a real, inverted image of the object placed in front of it.

Which of the following is not a characteristic of a concave lens?

A lens forms a magnified, erect and virtual image when an object is placed very close to it. Identify the lens.

An object is placed very near to a convex lens. The image formed is

A lens always forms a diminished, erect and virtual image. Identify the nature of the lens.

What will be the characteristics of the image formed when an object is placed between the focus and the optical centre of a convex lens.

An object is placed at a distance equal to $2f$ from a convex lens. Where is its image formed?