What does D mean in lens?

Conversely, diverging, or concave, lenses exhibit the opposite behavior. They disperse light rays outwards, leading to negative focal lengths. This characteristic translates into negative power values, indicative of their light-spreading attributes.

Lens power, a fundamental concept in optics, is quantitatively expressed in units of dioptres (D). This metric serves as a standardized measure for the optical strength of lenses.

The dioptre unit is inherently linked to the inverse of the meter (1/m), highlighting its relationship with distance-based properties. This equivalence underscores the mathematical foundation upon which lens power is based.

In the realm of converging, or convex, lenses, their ability to focus light rays inwards results in positive focal lengths. Consequently, these lenses possess positive power values, reflecting their light-concentrating properties.

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