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Refraction is the phenomenon of the bending of light when it
passes from one medium into another medium (transparent to light).

The amount of the light ray bending is dependent on the optical density of the medium and the angle of incidence with respect to the normal drawn at the point of incidence on the surface separating the two media.

The Snell's law tells us that the Sine of angle of incidence divided by sine of angle of refraction is the refractive index of the medium 2 with respect to the medium 1.

Sin i / Sin r = Mu2 / Mu1

The refraction is due to difference in optical densities of materials and different velocities of light in different media. Light bends in order to reach a point in medium 2 at the minimum time.

See diagrams.

The amount of the light ray bending is dependent on the optical density of the medium and the angle of incidence with respect to the normal drawn at the point of incidence on the surface separating the two media.

The Snell's law tells us that the Sine of angle of incidence divided by sine of angle of refraction is the refractive index of the medium 2 with respect to the medium 1.

Sin i / Sin r = Mu2 / Mu1

The refraction is due to difference in optical densities of materials and different velocities of light in different media. Light bends in order to reach a point in medium 2 at the minimum time.

See diagrams.