Reflection and Refraction of Light255(b) Repeating the steps of part (a) with the index of refraction of air replaced by that of water yields 363.5θ≥°, 226.5≤°, 1sin0.499≤, and 130.0. (c) Total internal reflection is not possible since polystyrenecarbon disulfidenn<22.47Applying Snell’s law at points A, B, and C, gives 11.40sin1.60sinαθ=(1) 1.20sin1.40sinβα=(2) and 21.00sin1.20sin=(3) Combining equations (1), (2), and (3) yields 21sin1.60sinθθ=(4) Note that equation (4) is exactly what Snell’s law would yield if the second and third layers of this “sandwich” were ignored. This will always be true if the surfaces of all the layers are parallel to each other. (a) If 130.0=°, then equation (4) gives ()12sin1.60sin30.053.1−=°(b) At the critical angle of incidence on the lowest surface,
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