Power of a Lens

📊 beginner

$$P = \frac{1}{f}$$

The measure of the degree of convergence or divergence of light rays by a lens.

Variables & Units

$P$

Optical Power

Unit: Dioptre ($D$)

$f$

Focal length

Unit: Meter ($m$)

Key Information

📐 Derived From

Geometric definition of lens strength.

💡 Example

A lens with $f = 50 cm$ ($0.5 m$) has a power of $+2 D$.

🔧 Applications

Optometry and eyeglass manufacturing.

⚠️ Constraints

$f$ must be in meters for $P$ to be in Dioptres.

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