$$n_1 \sin \theta_1 = n_2 \sin \theta_2$$
where:
- \(\theta_1\) is the angle of incidence, which is the angle the incident light wave makes with the normal to the surface at the point of incidence.
- \(\theta_2\) is the angle of refraction, which is the angle the refracted light wave makes with the normal to the surface at the point of refraction.
- \(n_1\) is the refractive index of the first medium (the medium from which the light wave is coming).
- \(n_2\) is the refractive index of the second medium (the medium into which the light wave is passing).
According to Snell's law, the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the refractive indices of the two media. This means that the amount of bending of the light wave (the angle of refraction) depends on the difference in refractive indices between the two media.
Snell's law can be used to predict the path of a light wave as it passes from one medium to another. It is also used in the design of optical devices such as lenses and prisms.
