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Question
When dots are placed on a page from a laser printer, they must be close enough so that you do not see the individual dots of ink. To do this, the separation of the dots must be less than Raleigh’s criterion. Take the pupil of the eye to be 3.0 mm and the distance from the paper to the eye of 35 cm; find the minimum separation of two dots such that they cannot be resolved. How many dots per inch (dpi) does this correspond to?
Question by OpenStax is licensed under CC BY 4.0.
Final Answer
$78 \textrm{ }\mu\textrm{m}$
$324 \textrm{ dots per inch}$
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OpenStax College Physics Solution, Chapter 27, Problem 67 (Problems & Exercises) (2:46)

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