48 and the angle of incidence is 20.0°, we can use Snell's Law to find the angle of refraction in linseed oil.
\[ n_1 \sin(\theta_1) = n_2 \sin(\theta_2) \]
\[ 1.00 \times \sin(20.0^\circ) = 1.48 \times \sin(\theta) \]
\[ \sin(\theta) = \frac{1.00 \times
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