The power of a lens is a measure of its ability to converge or diverge light, and it is measured in dioptres (D). One dioptre is defined as the reciprocal of the focal length in meters (Power = 1 / focal length in meters). Aeon is a unit of geological time. Lumen is the SI unit of luminous flux, measuring the total amount of visible light emitted by a source. Candela is the SI unit of luminous intensity, measuring the light output in a particular direction.
The power of a lens is measured in
Asked in MPPSC CS Prelims 2017 · Topic: Measurement/Unit (Units of Measurement (Definition and Characteristics))
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