power

power

1. In optics, the refractive vergence of a lens. 2. In physics and engineering, the rate at which work is done.
back vertex p. the effective p. of a lens as measured from a surface toward the eye; a standard for measurement of ophthalmic lenses.
carbon dioxide combining p. a measurement of the total CO2 that can be bound as HCO2 at a PCO2 of 40 mmHg at 25 C by serum, plasma, or whole blood.
equivalent p. the p. equal to an infinitely thin lens as measured on an optical bench.
resolving p. 1. definition of a lens; in a microscope objective lens it is calculated by dividing the wavelength of the light used by twice the numerical aperture of the objective. See also definition. 2. analogies to other modalities, e.g., two-point discrimination in neurological examination. Commonly misinterpreted as random error, although it has none of its properties. 3. resolution (2)
statistical p. in Neyman-Pearson hypothesis testing, the probability of rejecting the null hypothesis when it is false; the complement of an error of the second kind.

 

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