define the terms
(¡) refractive index
(¡¡) relative refractive index
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When we measure speed of light in two different media, relative refractive index of medium 2 with respect to medium 1 is defined as the ratio of speed of light in medium 1 to speed of light in medium 2. n21= speed of light in 1st medium / speed of light in second medium. Related Questions.
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