Power of the lens is the ___________ of the focal length .

Power of a lens is 4D, then the focal length of the lens will be_____

If the power of a lens is 4 dioptres , find its focal length.

If the power of a lens is 4 dioptres , find its focal length.

Power of a lens is + 3 D. What will be the focal length of the lens?

Choose the correct alternative from the bracket. Power of a lens Is the reciprocal of its focal length expressed in______ (Dioptre// metres)