Select the correct ray diagram for the image formation in a convex lens when an object is placed at focus $F_1$.

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 $\mathrm{AB}$.

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

Which of the following lenses would you prefer to use while reading very small letters?

Observe the following figure and complete the table.

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.

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.  

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

Observe the given incomplete diagram.

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