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Question: 

A properly exposed photograph is taken at $f/16$ and $\dfrac{1}{100} \textrm{ s}$. What lens opening is required if the shutter speed is $\dfrac{1}{400} \textrm{ s}$?

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

Quick Answer: 

f/8

Giancoli 7th Edition, Chapter 25, Problem 1

(3:38)

Chapter 25, Problem 1 is solved.

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