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Question: 

For a camera equipped with a 55-mm-focal-length lens, what is the object distance if the image height equals the object height? How far is the object from the image on the film?

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

Quick Answer: 

$d_o = 110 \textrm{ mm, }$ object to film distance = 220 mm

Giancoli 7th Edition, Chapter 25, Problem 5

(2:25)

Chapter 25, Problem 5 is solved.

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