In the figure below, light initially in material 1 refracts into material 2, crosses that material, and is then incident at the critical angle on the interface between materials 2 and 3. The indexes of refraction are $n_1 = 1.6$, $n_2 = 1.4$, and $n_3 = 1.2$. What is angle $\theta$ in degree? Select one: 26.8 16.8 36.8 25.2 29.7
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