You can,in principle, use Snell's Law to answer this question -
sin(i)/sin(r) = n
where i = angle of incidence, r = angle of refraction (both measured with respect to the normal to the surface), and n = refractive index. For crown glass n will be about 1.52
If we assume that the incident angle of 30.2 deg is measured with respect to the normal, we can write sin(30.2)/sin(r) = 1.52
r = 19.32 deg with respect to the normal.
If the angle of 30.2 deg is measured with respect to the surface the answer will be different.
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Verified answer
You can,in principle, use Snell's Law to answer this question -
sin(i)/sin(r) = n
where i = angle of incidence, r = angle of refraction (both measured with respect to the normal to the surface), and n = refractive index. For crown glass n will be about 1.52
If we assume that the incident angle of 30.2 deg is measured with respect to the normal, we can write sin(30.2)/sin(r) = 1.52
r = 19.32 deg with respect to the normal.
If the angle of 30.2 deg is measured with respect to the surface the answer will be different.