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:

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

The object is at 25 cm. The lens should create an image at 65 cm for the person to see. The image formed at 65cm will act as object for the eye.

A farsighted person has a near point of 65 cm rather than the normal 25 cm. What strength lens, in diopters, should be prescribed to correct this vision problem? Express your answer using two significant figures.

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