# Problem: A myopic person has a prescription for glasses which have power –1.05 D. What is her far point in centimeters if her glasses are 1.75 cm from her eyes?

###### FREE Expert Solution

Power of a lens:

$\overline{){\mathbit{P}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{f}}}$

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

For a myopic person, the object distance, so = infinity

1/∞ + 1/si = P

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###### Problem Details

A myopic person has a prescription for glasses which have power –1.05 D. What is her far point in centimeters if her glasses are 1.75 cm from her eyes?