A lens has a focal length of 28 cm and a diameter of 4.0 cm. What is the f - number of the lens?

Physics for Scientists and Engineers: Foundations and Connections
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ISBN:9781133939146
Author:Katz, Debora M.
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Chapter38: Refraction And Images Formed By Refraction
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A lens has a focal length of 28 cm and a diameter of 4.0 cm. What is the f - number of the lens?

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