In optics, what is meant by each of the following terms? (i) Refraction (ii) Index of refraction of a medium (iii) Dispersion (i) Refraction is the bending of light when it crosses an interface between media of different optical density. (ii) The ratio of the speed of light in vacuum to the speed of light in a medium is called the index of refraction of that medium. (iii) Dispersion is the variation of the index if refraction of a medium with the frequency of light.

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