State the thin-lens equation.

State the lateral magnification equation for a thin lens.

What sign is the focal length of a converging thin lens?

What sign is the focal length of a diverging thin lens?

An object is \(30\,\mathrm{cm}\) from a converging lens with \(f=10\,\mathrm{cm}\). Find the image distance.

For the lens in question 5, find the magnification.

A diverging lens has \(f=-15\,\mathrm{cm}\). An object is \(30\,\mathrm{cm}\) from it. Find \(s'\).

What does a negative image distance mean for a thin lens?

An object is at the focal point of a converging lens. Where is the image?

An object is very far away from a converging lens. Where is the image formed?

Define optical power and give its unit.

Find the power of a lens with \(f=0.25\,\mathrm{m}\).

Find the focal length of a lens with power \(-2.0\,\mathrm{D}\).

Two thin lenses in contact have powers \(+3.0\,\mathrm{D}\) and \(-1.0\,\mathrm{D}\). Find the combined power.

A converging lens produces a real image twice the object height. What is the ratio \(s'/s\)?

A converging lens has \(f=12\,\mathrm{cm}\). An object is \(8\,\mathrm{cm}\) from the lens. Find the image distance.

For the lens in question 16, find the magnification and describe the image.

List the three principal rays commonly used for a converging-lens ray diagram.

What approximation is assumed when using the simple thin-lens equation?

A lens has \(s=20\,\mathrm{cm}\) and forms a real image at \(s'=60\,\mathrm{cm}\). Find its focal length.