Thin Lens And Lens Maker Equations Video Lessons

Concept

# Problem: 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?

###### FREE Expert Solution

Lens equation:
$\overline{)\frac{\mathbf{1}}{{\mathbit{s}}_{\mathbit{o}}}{\mathbf{+}}\frac{\mathbf{1}}{{\mathbit{s}}_{\mathbit{i}}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbit{f}}}$

Power of a lens:

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

si = 18mm(1m/1000mm) = 0.018 m

so = 20.0cm(1m/100cm) = 0.2 m

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###### Problem Details

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?