Snell’s law calculator

To calculate the angle of refraction of an incident ray entering a raindrop enter:

1. The refractive index of air for a ray with wavelength 589.29 nm. n₁) = 1.000293
2. The refractive index of water for ray with wavelength 589.29 nm, (n₂) = 1.3333
3. The Angle of incidence of your ray as it strikes the surface. (θ_i) = angle between the ray and the normal

The angle of refraction (θ₂) will appear in the final box.