You are given kerosene, turpentine and water. In which of these does the light travel fastest ? Use the information given in Table 10.3.

For kerosene, n = 1.44 For turpentine, n = 1.47 For water, n = 1.33 Because water has the lowest refractive index, therefore light travels fastest in this optically rarer medium than kerosene and turpentine oil.