Lens equation:

$\overline{)\frac{\mathbf{1}}{{\mathit{s}}_{\mathit{o}}}{\mathbf{+}}\frac{\mathbf{1}}{{\mathit{s}}_{\mathit{i}}}{\mathbf{=}}\frac{\mathbf{1}}{\mathit{f}}}$

Power of a lens:

$\overline{){\mathbf{D}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{f}}}$

1 diopter = 1 m^{-1}

The lens has to create an image that appears to be at the near point of the person's uncorrected vision:

s_{i} = -72 cm

A farsighted person has a near point of 72 cm rather than the normal 25 cm. What strength lens, in diopters, should be prescribed to correct this vision problem?

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