The unit of focal power of a lens is

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 do you mean by power of a lens ? What is the SI unit of the power of a lens ? Calculate the power of a concave lens of focal length 25 cm.

The power of lens is P=1/(f') where f is focal length of the lens. The dimensions of power of lens is

The power of lens is P=1/(f) where f is focal length of the lens. The dimensions of power of lens is

The power of lens is P=1/(f') where f is focal length of the lens. The dimensions of power of lens is

The focal length of a lens is -50 cm. The nature and power of the lens is

If f is focal length of the lens, then the power of a lens is equal to