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AS physics- multiple choice- refractive index

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    Can somebody explain why the answer is D?
    I think I'm missing something simple

    Use Snell's law
    n1 sin(x1) = n2 sin(x2)

    where the angle x is with respect to the normal (perpendicular to the boundary). Then, the question asks for the final angle to be with respect to the boundary, so find 90 - x1.
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