Answer
$47^{\circ}$
Work Step by Step
By Snell's law,
$n_{air}\times sini=n_{qtz}\times sinr$
or, $1\times sin i = 1.46\times sin 30^{\circ}$
or, $i = sin^{-1}(0.73)=47^{\circ}$
For reflected beam, we can write angle of incidence - angle of reflection.
Thus, angle of reflection = $47^{\circ}$
