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(a) The print in many books averages 3.50 mm in height. How high is the image of the print on the retina when the book is held 30.0 cm from the eye? (b) Compare the size of the print to the sizes of rods and cones in the fovea and discuss the possible details observable in the letters. (The eye-brain system can perform better because of interconnections and higher order image processing.)
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Final Answer
  1. $-0.233 \textrm{ mm}$
  2. The size of a cone, $2 \textrm{ }\mu\textrm{m}$, is much less than the size of the $233 \textrm{ }\mu\textrm{m}$ image. Therefore details of the letter will be easily resolved.
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OpenStax College Physics Solution, Chapter 26, Problem 3 (Problems & Exercises) (3:57)

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