The correct option is B False
Optical density of turpentine oil (kerosene oil) is more than that of water, even though water is more mass dense than oil.Optical density is a function of number or atoms and NOT the weight of a substance. Since kerosene is a complex carbon compound, it has more number of atoms per molecule than in water. So when light enters kerosene, it hinders it better as compared to water. In simples words, more the number of obstacles (here atoms), lesser is the speed (speed of light in this case).
