A student investigates the refraction of a narrow beam of light as it passes from air into a flat glass block of refractive index 1.50. A protractor is placed at the boundary to measure the angles, as shown in the diagram.
What is the angle of refraction of the light ray inside the glass block to the nearest degree?
19∘19^\circ19∘
28∘28^\circ28∘
30∘30^\circ30∘
45∘45^\circ45∘