Define absolute refractive index? What is the relation between the relative refractive index between two media and the absolute refractive index of the media?
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If the medium 1 is to be taken as vacuum or air then the refractive index is considered with respect to vacuum. This is absolute refractive index of the medium
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Absolute refractive index is defined as the ratio of speed of light in air or vacuum to the speed of light in the medium.
n = c/v
=Speed of light in air/speed of light in medium.
If medium 1 is vacuum and medium 2 is glass then
n(glass)=1/n(air with respect to glass )
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