### Shortcut Methods

##### 7 : Snell’s Law Shortcut for Plane Surfaces

When light passes from one medium to another through a plane surface (e.g., air to glass), Snell’s Law simplifies to: $$(n_1\sin(\theta_1) = n_2\sin(\theta_2)),$$ where n_{1} and n_{2} are the refractive indices, and θ_{1} and θ_{2} are the angles of incidence and refraction, respectively.