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Question: 

A human eyeball is about 2.0 cm long and the pupil has a maximum diameter of about 8.0 mm. What is the “speed” of this lens?

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

Quick Answer: 

f/2.5

Giancoli 7th Edition, Chapter 25, Problem 11

(0:29)

Chapter 25, Problem 11 is solved.

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