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Question: 

A 65-mm-focal-length lens has $f$-stops ranging from $f/1.4$ to $f/22$. What is the corresponding range of lens diaphragm diameters?

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

Quick Answer: 

3.0 mm to 46 mm

Giancoli 7th Edition, Chapter 25, Problem 3

(0:42)

Chapter 25, Problem 3 is solved.

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