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Question: 

The closely packed cones in the fovea of the eye have a diameter of about $2 \; \mu \textrm{m}$. For the eye to discern two images on the fovea as distinct, assume that the images must be separated by at least one cone that is not excited. If these images are of two point-like objects at the eye’s 25-cm near point, how far apart are these barely resolvable objects? Assume the eye’s diameter (cornea-to-fovea distance) is 2.0 cm.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$-50 \; \mu m$

Giancoli 7th Edition, Chapter 25, Problem 20

(3:40)

Chapter 25, Problem 20 is solved.

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