The ratio of speed of light in vacuum to the speed of light in the given medium is called as
a)Relative refractive index
b)Absolute refractive index
c)Dispersion
d)Optical density
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Relative refractive index
Explanation:
Refractive index or the index of refraction is the ratio of the speed of light in vacuum (or air) to the speed of light in a transparent material.
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