What is geometral power?

Geometrical power, often referred to in optics, is a measure of the ability of a lens or optical system to converge or diverge light rays. It is defined as the reciprocal of the focal length (in meters), expressed in diopters (D). A lens with a shorter focal length has a higher geometrical power, indicating it can bend light more sharply. This concept is crucial in designing optical devices like glasses, cameras, and microscopes.