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English definition of “power”

power

noun [U] (IMAGE SIZE)    /paʊər/ US  /paʊɚ/
the amount by which an image is increased by a device used for seeing things that are very small or a long distance away: What's the magnification power of your binoculars ? You'll need a very high-power microscope to see something as small as that. A low-power telescope is enough if you only want to look at the moon .Optics, microscopy and lasersEyesight, glasses and lenses
(Definition of power noun (IMAGE SIZE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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