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Question: 

A television camera lens has a 17-cm focal length and a lens diameter of 6.0 cm. What is its $f$-number?

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

Quick Answer: 

f/2.8

Giancoli 7th Edition, Chapter 25, Problem 2

(0:23)

Chapter 25, Problem 2 is solved.

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