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Question: 

A magnifier is rated at $3.5\times$ for a normal eye focusing on an image at the near point.

  1. What is its focal length?
  2. What is its focal length if the $3.5\times$ refers to a relaxed eye?

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

Quick Answer: 
  1. 10 cm
  2. 7.1 cm

Giancoli 7th Edition, Chapter 25, Problem 24

(0:58)

Chapter 25, Problem 24 is solved.

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