Question

The refractive index of glycerine is 1.46. What is the speed of light in glycerine ? 

[Speed of light in vacuum = 3 × 10⁸ m/s]

Answer 1

Data : n_g = 1.46, c = 3 × 10⁸ m/s c

n_g = \(\cfrac{c}v\)

v = \(\cfrac{c}n\) = \(\cfrac{3\times10^8}{1.46}\) = 2.055 × 10⁸ m/s 

This is the speed of light in glycerine.