- #1
sveioen
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Homework Statement
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?
Homework Equations
Snells law
[tex]\frac{\sin \theta_1}{\sin \theta_2}=\frac{v_1}{v_2}[/tex]
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?