For which position of the object does a convex lens form a virtual and erect image? Explain with the help of a ray diagram.
When an object is placed between the focus and the optical centre of a convex lens, a virtual and erect image of the object is formed.
When the object is placed between the focus F1 and optical centre O:
In this case, the image is formed on the same side as the object. This image is virtual, erect, and very large in size. It is formed behind 2F1.
P’Q’ is the image.
PQ is the object.
F2 is the focus on the other side of the lens.