Question

speed of light in glass is 2 × 10^8 m/s and refractive index is 1.5. What is the speed of light in medium whose refractive index is 4/3?

Answer 1

Velocity of light in the medium= velocity of light of light / refractive index
= 3*10^ 8/(4/3)= 2.25*10^8

Answer 2

R.I in the medium = 4/3

Speed of light in air(vacuum) = 3*10^8 m/s

⇒Speed of light in the given medium = 3*10^8 / (4/3)

⇒Speed of light in the given medium = 3*10^8 * 3/4

⇒Speed of light in the given medium = (9*10^8)/4

⇒Speed of light in the given medium = 2.25*10^8 m/s