Light enters from air to kerosene having a refractive index of 1.47. What is the speed of light in kerosene?

Given: kerosene have a refractive index of 1.47
Speed of light in air is 3×10^8m/s

Refractive index of the kerosene =speed of light in air /speed of light in the kerosene

1.47=3×10^8/speed of light in the kerosene

speed of light in kerosene =3×10^8 /1.47

Speed of light in the kerosene =2.04×10^8m/s
Therefore, 2.04×10^8m/s is the required speed of light in kerosene.