A ray of light in air meets the flat surface of a glass plate of refractive index 1.52…

Step 1. The reflected ray. The angle of reflection equals the angle of incidence: $56^\circ$.

Step 2. The refracted ray. $\sin r = \dfrac{\sin 56^\circ}{1.52} = 0.5454$, so $r = 33.1^\circ$.

Step 3. The angle between the two rays. The reflected ray is $90^\circ - 56^\circ = 34^\circ$ above the surface. The refracted ray is $90^\circ - 33.1^\circ = 56.9^\circ$ below it. Together the angle is $34^\circ + 56.9^\circ = 90.9^\circ$.