If the object is placed at $2$F in front of a convex lens, then where will the image be formed?

Where will you keep an object in front of a convex lens in order to get a virtual and magnified image?

The diagram shows an object '$O$', and its image '$I$' formed by a lens. In the diagram, draw the lens and the rays to show how the image is formed. Mark focus $F$, of the lens. Name the lens.

Observe the given incomplete diagram.

Complete the diagram by drawing refracted rays and show the image formed.

If the object is placed at a principal focus $\mathrm{F}_{1}$ of a convex lens, draw the ray diagram for the image formation.

A virtual, diminished image is formed when an object is placed between the optical centre and the principal focus of a lens.
(i) Name the type of lens which forms the above image.
(ii) Draw a ray diagram to show the formation of the image with the above stated characteristics.  

Observe the following figure and complete the table.

How can an erect and magnified image be formed with the help of a convex lens? With the help of which type of lens, long-sightedness can be rectified?

An object is placed between the optical centre and the focus of a thin convex lens. What is the nature of the image of the object?

An object $\mathrm{AB}$ is placed between $\mathrm{O}$ and ${\mathrm{F}}_1$ on the principal axis of a converging lens as shown in the diagram.

Copy the diagram and by using three standard rays starting from point $\mathrm{A}$, obtain an image of the object $\mathrm{AB}$.