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Snell's law of refraction

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A ray of light traveling through medium start text, A, end text is incident on another medium start text, B, end text, where it refracts making an angle of 60, degree with the normal.
The refractive index of medium start text, B, end text with respect to medium start text, A, end text, n, start subscript, start text, B, A, end text, end subscript, equals, square root of, start fraction, 2, divided by, 3, end fraction, end square root.
What is the angle of incidence?
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