Question

One Dioptre is equal to ____________

Answer 1

Explanation:

1. Dioptre is the unit of power of lens or curved mirror.
2. Dioptre is denoted by $\mathrm{D}$.
3. The formula of Dioptre is $\mathrm{D}=\frac{1}{\mathrm{f}}$, where $\mathrm{f}$ is the focal length.
4. We know that unit of focal length is meter $\left(m\right)$.
5. Therefore 1 Dioptre is equal to $1m^{-1}$.

Hence the answer is $1m^{-1}$.