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Question: 

A $720\times$ microscope uses a 0.40-cm-focal-length objective lens. If the barrel length is 17.5 cm, what is the focal length of the eyepiece? Assume a normal eye and that the final image is at infinity.

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

Quick Answer: 

1.5 cm

Giancoli 7th Edition, Chapter 25, Problem 44

(1:00)

Chapter 25, Problem 44 is solved.

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