Question

the power of lens is IDthen focal length is​

Answer 1

Answer:

1 dioptre is SI unit of the power of a lens whose focal length is 1 metre. It is denoted by the letter D. Thus 1D = 1 m-1. Simply, when focal length ' f ' is expressed in metres, then, power is expressed in dioptres.

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Answer 2

Answer:

The power of lens is 1D then focal length is 100cm.

We know

Power of lens, P=

f

1

If P=1D⟹f=1m or 100cm