1.

One diopter is the power of the lens with the second focal length

Answer»

'' 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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