Question

the angle of incidence for a ray of light from air to water interface is 40 degree. if the ray travels through the water with a refractive index of 1.33, calculate the angle of refraction.

Answer 1

N1 Sin θ1 = N2 sin θ2 Snell's equation

Sin θ2 = 1 / 1.33 * Sin 40

Sin θ2 = .752 * .643 = .483

θ2 = 28.9 deg