A Level Physics Exam Questions

Hi, I don't get these questions.

1. The refractive index of water is 1.33. A light ray in water is directed at the water surface at an angle of incidence of 40°. Calculate the angle of refraction of the light ray at this surface.

[the answer is 58.7°, how??]

2. A light ray enters an equilateral glass prism of refractive index 1.55 at the midpoint of one side of the prism at an angle of incidence of 35°. The angle of refraction of the light ray in the glass is 22°.

a) Show that the angle of incidence where the light ray leaves the glass prism is 38°.

b) Calculate the angle of refraction of the light ray where it leaves the prism.
[the answer is 72.6°]