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Power of a lens is defined as the inverse of its focal length. The unit of power of lens is  m^{-1} or Diopter(D).

Power = 
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The relations defined between power and focal length is
Power=1/focal length

If there are several lenses then effective power is given by the sum of all powers.
 P_{eq}=  \frac{1}{f1} + \frac{1}{f2} +...
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