Given:
Angle of incidence in vacuum, $\theta_1 = 35.0^\circ$
Angle of incidence in liquid, $\theta_2 = 20.3^\circ$
Angle of refraction in vacuum, $\theta_1' = 35.0^\circ$
Using Snell's Law: $\frac{n_1}{n_2} = \frac{\sin \theta_2}{\sin \theta_1}$
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