PHYSICAL QUANTITY

Lens power: formulas and units of measurement

Lens power: symbol D, unit diopter. Formulas and explanations for Optics.

DD\text{дптр}diopter

KEY CONNECTIONS

Formulas

D=\frac{1}{F}D = 1 / F

D=\frac{1}{d}+\frac{1}{f}D = 1 / d + 1 / f

D=D_1+D_2D = D₁ + D₂

NOTATION

D: Optical power is the ability of a lens to collect or scatter light.
F: Focal length is the distance from the optical center of the lens to its main focus.
d: Object distance - the distance from the lens to the object in question.
f: Image distance is the distance from the lens to the resulting image.
D_1: The optical power of the first lens is the refractive power of the first lens of the system.
D_2: The optical power of the second lens is the refractive power of the second lens of the system.

THEORY

PRACTICE