A converging lens has a focal length of 50cm. The power of this lens is :

A converging lens has a focal length of 50 cm. The power of the lens In dioptre is

A converging lens has a focal length of 50mm. What is the power of the lens?

A lens has focal length of 50 cm. What is its power ?

A concave lens has a focal length of 50 cm. Calculate its power.

A concave lens is kept in contact with a convex lens of focal length 20 cm . The combination works as a converging lens of focal length 100 cm . Calculate power of concave lens.