The refractive index or index of refraction n D is the same of the physicochemical properties of substances optical medium. It is equal to velocity c of light of a given wavelength in empty space vacuum divided by its velocity v in a substance according to following equation:.
When light travels at an angle between two materials, it bends according to their refractive indices. In order to reflect, light must be on the wider side of the critical angle. The refractive sign can provide information for us about the behavior of rattle-brained. When light passes through the different substances its velocity decreases by increasing of the refractive index of these substances.
It can be due to interaction between molecules of components in substrate and effect of these interactions on light.
Also in the most substrates, the refractive index decreases by increasing of the temperature. The interaction tween molecules decreases as the temperature increases. The refractive index of different substrates measures with refractometers. There are four main types of refractometers: There is furthermore the Rayleigh Refractometer used typically for measuring the refractive indices of gases. A sodium lamp may be used to take care of the light source at a known wave-length In utmost of substrates which we realize the refractive index have a positive value more than zero but in Veselago shows that there are substrates with gainsaying permittivity and negative permeability.
- Critical angle C = 45 deg. Let the minimum index of refraction = n n = 1/sin(45 deg) n = 1/(1/sqrt(2)) = sqrt(2) = Index of refraction of water.
- The smallest angle of incidence at which a light ray passing from one medium to another less refractive medium can be totally reflected from the boundary between the two. the minimum angle of incidence beyond which total internal reflection occurs for light traveling from a medium.
- At one particular angle (critical angle), the refracted light will not go into m2, but instead will travel along the surface between the two media (sine [critical angle]. Received Date: Apr 29, / Accepted Date: May 02, / Published In order to reflect, light must be on the wider side of the critical angle.
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