Question

define absolute refractive index of a medium light enters from air to water having refractive index 4/3 find the absolute refractive index of a medium

Answer 1

absolute refractive index is the ratio of velocity of light in vacuum to the velocity of light in medium .
n21 = n2 / n1.
so absolute refractive index of medim ,
= n medium / n air
= 4/3

Answer 2

Answer:

When light travels from air to another transparent medium 'm' , the refractive index of m with respect to air is called the absolute refractive index of medium 'm' .

μ = Speed of light in air/speed of light in medium

=> 4/3 = 3 * 10^8/ speed of light in water

=> Speed of light in water = 3 * 10^8/1.3

=> 2.30 * 10^8 m/s