Before a race, a photographer finds that she can make a

Chapter 35, Problem 35.11

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Before a race, a photographer finds that she can make a perfectly exposed photo of the track while using a shutter speed of 1/250 s and a lens setting of f/8.0. To freeze the sprinters as they go past, she plans to use a shutter speed of 1/1000 s. To what f@number must she set her lens?

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