Define power of a convex lens. What is its unit?

Define power of a lens. What is its unit ? One student uses a lens of focal length 50 cm and another of - 50 cm . What is the nature of the lens and its and power used by each of the them ?

Define power of a lens and write its unit

Define power of a lens and give its ralation with focal length.

a) What do you understand by the power of a lens? Name one factor on which the power of a lens depends. b) What is the unit of power of a lens? Define the unit of power of a lens. c) A combination of lenses for a camera two converging lenses of focal length 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination.

What is a convex lens ?

what is the power of a convex lens having focal length 0.5 m ?

What is the power of a convex lens whose focal length is 80 cm?

The power of a convex lens is 2.5 dioptres. Find the focal length.