Define refractive index of a tranparent medium . The speed of light in a medium of absolute refractive index ` 1.5 " is " 2xx10^(8)ms^(-1)` . What is the speed of light in vacuum ?
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The refractive index of medium 2 with respect to medium 1 is given by the ratio of the speed of light in medium 1 and the speed of light in medium 2 . Refractive index `(eta_(21))=("Speed of light in medium 1")/(" Speed of light in medium 2")` Absolute refractive index =1.5 , Speed of light in medium =`2xx10^(8)m//s` Speed of light in vacuum = Absolute refractive index `xx` Speed of light in medium `= 1.5xx2xx10^(8)m//s =3xx10^(8)m//s`
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