__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:

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

s_{i} = 18mm(1m/1000mm) = 0.018 m

s_{o} = 20.0cm(1m/100cm) = 0.2 m

Suppose the distance from the lens system of the eye (cornea + lens) to the retina is 18 mm.

What must the power of the lens be when looking at an object 20.0 cm from the eye?

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