How to find the index of refraction of light
Light rays can not only reflected but refracted. This occurs when moving from one environment to another. The speed of light in any environment is somewhat smaller than in a vacuum, and this depends on the refractive index of the medium.
Instruction how to find the index of refraction of light
If you omit a spoon in a glass of water, it seems that it changes its shape or forks. This illusion is obtained due to a phenomenon called refraction of light. When the beam passes from one medium to another, it is refracted. The beam incident at the same angle to the perpendicular drawn to the phase boundary, has one corner, but getting into another medium, the photons move on from a different angle. This explains the number of natural phenomena (such as the rainbow) and allows you to create many optical devices.
light refraction law is worded as follows: incident and refracted rays, as well as perpendicular, drawn to the interface at the point of incidence, lie in the same plane, in other words, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant: sin i / sin j = v1 / v2 = n21. where i - the magnitude of the angle of incidence, j - the refractive angle, n21 - relative refractive index of the second medium based on the first, v1- speed of light in the first medium, v2- speed of light in the second srede.Sleduet noted that always greater v1 v2. This means that the speed of the light beam at a considerably lower contact beam in a different environment. When a ray exits from the medium, it has the highest speed. The relative refractive index shows how many times the speed of light in the first medium is greater than the angle of refraction in vtoroy.Otnositelny is by finding private absolute refractive index: n21 = n2 / n1
Absolute refractive index is a ratio of the propagation velocity of electromagnetic wave in vacuum to the phase velocity of a medium: n = c / v, c - velocity of the rays in vacuum, v - phase velocity rays srede.Kazhdaya medium has a refractive index: n1 = c / v1, n2 = c / v2V elementary physics and higher medium having the lowest refractive index is called an optically less dense sredoy.Absolyutny vacuum refractive index is equal to n = c / v = 1, and the same setting as the air is not very different from him that It is also taken to be unity.