SNELL'S LAW

TO CALCULATE THE SPEED OF LIGHT IN A MEDIUM [WATER WHOSE REFRACTIVE INDEX IS 1.33. 

TRY THIS NUMERICAL PROBLEM

CACULATE THE REFRACTIVE INDEX OF A MATERIAL IF THE SPEED OF LIGHT IN THAT MEDIUM IS  2  X  10⁸  m/s.    [Ans:  1.5  refractive index has no units]