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The human eye has an approximate angular resolution of $\theta=5.8 \times 10^{-4} \mathrm{rad}$ and typical photo printer prints a minimum of 300 dip (dots per inch, 1 inch $=2.54 \mathrm{~cm}$ ). At what minimal distance $d$ should a printed page be held so that one does not see the individual dots?
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The correct answer is:
$14.59 \mathrm{~cm}$
$\theta=\frac{x}{d}$
$5.8 \times 10^{-4}=\frac{2.54}{300} \times \frac{1}{d}$
$d=14.59 \mathrm{~cm}$
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