the focal length of a lens is +40cm then the power of the lens is
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P = - 1/f
P= - 1/40
P = - 1/4x10
P = - 0.25/ 10
P = - 0.025D
P= - 1/40
P = - 1/4x10
P = - 0.25/ 10
P = - 0.025D
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