The critical angle for water is 48.2°. Then it's refractive index is
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Explanation:
We know that x = 90º because we have a critical angle, in which the angle refracts. sin (x) = sin (90º) = 1, thus m*sin(y) = n*sin(x), hence m = 1 / sin(48.2) is our refractive index. Hence, its refractive index is 1.341424808.
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