(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Given a three layer model

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[tex]v_1=1.5[/tex]km/s

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[tex]v_2=1.3[/tex]km/s

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[tex]v_3=2.0[/tex]km/s

Assume a ray goes through layer 1 and hits the interface between layer 1 and layer 2. What is the critical angle?

2. Relevant equations

Snells law

[tex]\frac{\sin \theta_1}{\sin \theta_2}=\frac{v_1}{v_2}[/tex]

3. The attempt at a solution

To find the critical angle, you normally take [tex]\sin \theta_c = \frac{v_1}{v_2}=\frac{1.5}{1.3}[/tex]. But in this case that means I have to take [tex]\sin^{-1}[/tex] of a value that is over 1! How do I solve this?

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# Snell's law, critical angle & refraction

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