PHYSICS

 ABSOLUTE  REFRACTIVE INDEX  The absolute refractive index of a medium is the ratio of speed of light in vacuum and the speed of light in the medium. Absolute refractive index = Speed of light in vacuum or air                                                     Speed of light in the medium  For example, A.r.i of glass = speed of light in vacuum/speed of light in glass  3×10⁸/2×10⁸= 3/2=1.5 Its value is equal or more than 1. For vacuum or air, its value is 1. So its minimum value is 1. RELATIVE REFRACTIVE INDEX  The relative refractive index of a medium (a) with respect to another medium (b) is the ratio of speed of light in medium (b) and the speed of light in medium (a). Relative refractive index of  (a) wrt (b)=Speed of light in medium (b )                        ...