For which position of the object does a convex lens form a virtual and erect image?

Q. A convex lens forms a virtual image of an object. The position of the object is between optical centre and focus.

Q. By drawing ray diagrams, discuss the characteristics of the image formed by a convex lens when the object is:
(a) between the optical centre and the focus.
(b) at the focus.
(c) at $2F_1$.
(d) at infinity.
[5 MARKS]

Q. For the object placed between optical centre and focus of a convex lens, the image is :

Q. When an object approaches a convex lens from infinity to focus, then image formed by it shifts

Q. In a convex lens, when the object is placed between optical centre and focus, then the image formed is .................$\left(virtual/real\right)$.