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Question: 

How many uncoated thin lenses in an optical instrument would reduce the amount of light passing through the instrument to 50% or less? (Assume the same transmission percent at each of the two surfaces—see page 697.)

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

Quick Answer: 

9 lenses

Giancoli 7th Edition, Chapter 24, Problem 49

(2:38)

Chapter 24, Problem 49 is solved.

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