One diopter is the power of the lens with the second focal length
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'' The power in diopters ism the reciprocal of the focal length in meters(or meters,if you prefer). So a focal length of 1 m is 1 diopter, while a focal length of 0.25 m is 4 diopters. If ''2.5 power'' really means 2.5 diopters,then the lens' focal length is 400 m.
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