what is meant by power of a lens ? you have 3 lens L1 L2 L3 of +10D +5D -10D rspectively. state the nature and focal length of each lens .
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Based on the above formula, the focal length of a lens, given its diopter, is calculated as follows: For example, if a lens has diopter +2, its focal length is 1000/2=500mm, and a lens of +4 diopter has focal length 1000/4 = 250mm.
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