In the Figure n1 and n2 represent the indices of refraction for the two media and a 1 and a 2 are the angles of incidence and refraction that the ray R makes with the normal perpendicular line NN at the boundary. Snells law is also known as the Snell-Descartes law and the law of refraction. Sen t where.
I incident angle it is the angle that forms the incident ray with the normal N.
When light travels through a vacuum or a. N 1 sinth 1 n 2 sinth 2. Snells law is a formula used to describe the relationship between the angles of incidence and refraction when referring to light or other waves passing through a boundary between two different isotropic media such as water glass or air. One may also ask what is the formula of refraction.