The refractive index for two media “air-water” is 1.33. a) The angle of incidence of a ray of light from

The refractive index for two media “air-water” is 1.33. a) The angle of incidence of a ray of light from the air on the surface of the water is 72 °. What is the angle of refraction of a ray of light? b) The angle of refraction of a ray of light entering from air into water is 38 °. What is the angle of incidence of the beam on the interface between two “air-water” media?

a) Solution:
0.9511 / sin y = 1.33,
sin y = 0.7151,
y = 46 °,
Answer: 46 °

b) Solution:
sin a / 0.6157 = 1.33,
sin a = 0.8189,
a = 55 °
Answer: 550