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The h-index, created by Jorge E. Hirsch in 2005, is an attempt to measure the research impact of a scholar. In his 2005 article Hirsch put forward an easily computable index, h, which gives an estimate of the importance, significance, and broad impact of a scientist's cumulative research contributions..
Refractive index is defined as the relative speed at which light moves through a material with respect to its speed in a vacuum. By convention, the refractive index of a vacuum is defined as having a value of 1.0. The index of refraction, n, of other transparent materials is defined through the equation: n = c/v. where c is the speed of light, and v is the velocity of light in that material.