name the instrument used for measuring the power of a lens
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A dioptre or dioptre meter, is a unit ofmeasurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal lengthmeasured in metres.
hope it helps u
hope it helps u
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focal length,convex lens and concave lens...p=-1/f ... thanks jazakallah..expe the BRAINLIEST
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