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.
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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