Question

Which of the following is the unit of power of lens

Answer 1

I don't see the options anywhere .

But the answer is dioptre .(D)

Its written as capital D also

One dioptre is equal to the power of the lens of focal length 1 metre .

So I D = 1/1m

Answer 2

Answer:

I don't see the options anywhere .

But the answer is dioptre .(D)

Its written as capital D also

One dioptre is equal to the power of the lens of focal length 1 metre .

So I D = 1/1m