A lens of focal length $20 \mathrm{cm}$ is used to produce a ten times magnified image of a film slide on a screen. How far must the slide be placed from the lens?

An object placed $4 \mathrm{cm}$ in front of a converging lens produces a real image $12 \mathrm{cm}$ from the lens.

What is the magnification of the image?

An object placed $4 \mathrm{cm}$ in front of a converging lens produces a real image $12 \mathrm{cm}$ from the lens.

What is the focal length of the lens?

An object placed $4 \mathrm{cm}$ in front of a converging lens produces a real image $12 \mathrm{cm}$ from the lens.

Draw a ray diagram to show the formation of image. Mark clearly $F$ and $2F$ in the diagram.

An object $2 \mathrm{cm}$ tall stands on the principal axis of a converging lens of focal length $8 \mathrm{cm}$. Find the position, nature and size of the image formed if the object is:

$12 \mathrm{cm}$ from the lens

An object $2 \mathrm{cm}$ tall stands on the principal axis of a converging lens of focal length $8 \mathrm{cm}$. Find the position, nature and size of the image formed if the object is:

$6 \mathrm{cm}$ from the lens