# A report onRefractive index, Refraction and Light                                              In optics, the refractive index ( refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium.

- Refractive index

The refractive index determines how much the path of light is bent, or refracted, when entering a material.

- Refractive index

Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction.

- Refraction

For light, refraction follows Snell's law, which states that, for a given pair of media, the ratio of the sines of the angle of incidence θ1 and angle of refraction θ2 is equal to the ratio of phase velocities (v1 / v2) in the two media, or equivalently, to the refractive indices (n2 / n1) of the two media.

- Refraction

where θ1 is the angle between the ray and the surface normal in the first medium, θ2 is the angle between the ray and the surface normal in the second medium and n1 and n2 are the indices of refraction, n = 1 in a vacuum and n > 1 in a transparent substance.

- Light

This change of direction is known as refraction.

- Light ## 1 related topic with Alpha ## Wavelength

Spatial period of a periodic wave—the distance over which the wave's shape repeats.

Spatial period of a periodic wave—the distance over which the wave's shape repeats.               Examples of waves are sound waves, light, water waves and periodic electrical signals in a conductor.

This change in speed upon entering a medium causes refraction, or a change in direction of waves that encounter the interface between media at an angle.

For electromagnetic waves the speed in a medium is governed by its refractive index according to