In general, n depends on the frequency of the light. Snell's law states that, at the boundary between two materials of refractive indexes n 1 and n 2 n 1sin θ 1 = n 2sin θ 2 where θ 1 and θ 2 are the incident and refracted angles to the normal (see figure 1).n = c v where c is the speed of light in a vacuum and v is the speed of light in the material. N is dimensionless Mathematical expressions This property allows the construction of lenses that can, for example, focus the light to form real images, as in a cinema projector. Refractive index determines how much a ray of light changes direction when it travels from one medium into another. Figure 1: Light passes from a material of refractive index n 1 at incidence angle θ 1 into a material of refractive index n 2 at refraction angle θ 2.
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