Question

you are given kerosene oil,turpentine oil and water .in which of these does light travel fastest??

Answer 1

out of these light will travel fast in lest refractive index medium which is of water due to which light travel faster in water.

Answer 2

For Kerosene n = 1.44 

For turpentine n = 1.47 

and for water n = 1.33 

As refractive index of water is least out of three substances, hence as per relation v = c / n, 

it is clear that speed of light is maximum in water. So, light travels fastest in water.