Question

Define absolute refractive index of a medium.light enters from air to water having the refractive index 4/3.find the speed of light in watee

Answer 1

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