Lens Power Quiz

How is lens power related to focal length?

• Lens power is not related to focal length at all.

• Lens power is inversely related to focal length.

• Lens power is directly related to focal length.

• Lens power is proportional to focal length squared.

Explain the difference between converging and diverging lenses in terms of their power.

• Converging lenses have positive power, while diverging lenses have zero power.

• Converging lenses have positive power, while diverging lenses have negative power.

• Converging lenses have zero power, while diverging lenses have positive power.

• Converging lenses have negative power, while diverging lenses have positive power.

Convert a lens power of +2.5 diopters to meters^-1.

• 0.5

• 0.3

• 0.4

• 0.6

A lens has a focal length of 10 cm. What is its power in diopters?

• 10 diopters

• 20 diopters

• 15 diopters

• 5 diopters

Which type of lens has a positive power?

• Bifocal lens

• Flat lens

• Converging lens

• Diverging lens

Calculate the power of a lens with a focal length of 20 cm.

• 0.02 diopters

• 0.25 diopters

• 0.1 diopters

• 0.05 diopters

What is the unit of measurement for lens power?

• diopters

• inches

• grams

• meters

Describe how the power of a lens changes when the focal length decreases.

• The power of the lens decreases when the focal length decreases.

• The power of the lens remains constant when the focal length decreases.

• The power of the lens becomes negative when the focal length decreases.

• The power of the lens increases when the focal length decreases.

If a lens has a power of -3.0 diopters, is it converging or diverging?

• diverging

• positive

• neutral

• converging