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Question: 

A beam of light is emitted 8.0 cm beneath the surface of a liquid and strikes the air surface 7.6 cm from the point directly above the source. If total internal reflection occurs, what can you say about the index of refraction of the liquid?

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

$n_1 \geq 1.45$

Giancoli 7th Edition, Chapter 23, Problem 38

(2:60)

Chapter 23, Problem 38 is solved.

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