Which lens can be used as a magnifying glass? For which position of the object does a convex lens form:
$(a)$ a virtual and erect image?
$(b)$ a real and inverted image of the same size as that of the object?
Draw labelled ray diagrams to show the formation of the required image in each of the above two cases.

(N/A) convex lens can be used as a magnifying glass.
$(a)$ When the object is placed between the optical centre $O$ and the principal focus $F_{1}$,the convex lens forms a virtual,erect,and magnified image on the same side as the object.
$(b)$ When the object is placed at $2F_{1}$,the convex lens forms a real,inverted image of the same size as the object at $2F_{2}$ on the other side of the lens.
[Refer to the provided ray diagrams for the visual representation of these cases.]