The near point of a person's eye using a ruler and a coin and compare it with the typical value of near point. The focal length of each eye lens when the person focus on an object at his near point.

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Chapter 38, Problem 64PQ

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The near point of a person's eye using a ruler and a coin and compare it with the typical value of near point. The focal length of each eye lens when the person focus on an object at his near point.

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