power of lens

Question

Power P of lens in diopters is:

RankGuru · Accepted Answer

**Power ($P$)** is the measure of the convergence or divergence that a lens introduces in the light rays falling on it.
- $P = \frac{1}{f}$ where $f$ is in **meters**.
- The SI unit is the **Diopter (D)**.
- Converging (convex) lenses have positive power, and diverging (concave) lenses have negative power.

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Power P of lens (f in meters) equals?