Question 7.
Solve the following examples.
If the speed of light in a medium is 1.5 x 108 m/s, what is the absolute refractive index of the medium?
Answer:
Absolute refractive index of medium is with respect to air.
So absolute refractive index of medium μ = 
Speed of light in air = 3 x 108 m/s
Speed of light in the given medium = 1.5 x 108 m/s
Absolute refractive index of medium μ = 
So μ = 2
