Optical power

In optics, optical power (also referred to as dioptric power, refractive power, focal power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or diverges light.^[1] It is equal to the reciprocal of the focal length of the device; high optical power corresponds to short focal length. The SI unit for optical power is the inverse metre (m⁻¹), which is also called a dioptre (symbol: dpt or D) when used as a unit of optical power.

^ Basu, Dipak (2018-10-08). Dictionary of Pure and Applied Physics. CRC Press. ISBN 978-1-4200-5022-6.

[1] Basu, Dipak (2018-10-08). Dictionary of Pure and Applied Physics. CRC Press. ISBN 978-1-4200-5022-6.

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