power of lens

Question

Power P of lens (f in meters) equals?

RankGuru · Accepted Answer

1. **Definition**: The power of a lens is a measure of its ability to converge or diverge light rays.
2. **Mathematical Relation**: It is quantitatively defined as the reciprocal of the focal length ($f$).
3. **Formula**: **$P = \frac{1}{f}$**.
4. **Unit**: The SI unit of power is the **Diopter (D)**, where $1$ D $= 1 	ext{ m}^{-1}$.
5. **Property**: A converging (convex) lens has positive power, while a diverging (concave) lens has negative power.

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Power P of lens in diopters is: