Q. You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.
Using the information given in table, the refrative index of kerosene is 1.44, that of turpentine is 1.47 and that of water is 1.33. Clearly, water having lower refractive index 1.33, is optically rarer than kerosene and turpentine. Therefor the light travels fastest in water because of its lower optical density