(i)         Refractive index of a phase is that functionality which decides speed of light in it.

(ii)        It is a scalar, dimensionless and unit less quantity.

(iii)       Absolute refractive index:

When light travels from vacuum to any transparent medium then refractive index of phase w.r.t. vacuum is known as it's absolute refractive index i.e. 

Absolute refractive indices for glass, water and diamond are respectively   

(iv)       Relative refractive index:

When light travels from medium (1) to medium (2) then refractive index of medium (2) w.r.t. medium (1) is called it's relative refractive index i.e.  (where  and  are the speed of light in medium 1 and 2 respectively).

(v)        When we call refractive index we seem absolute refractive index.

(vi)       The minimum value of absolute refractive index is 1. For air it is very closer to 1. (  1.003)

(vii)      Cauchy's equation :       

(viii)     If a light ray travels from medium (1) to medium (2), then 

(ix)       Dependence of Refractive index :

(a)        Nature of the medium of refraction and incidence.

(b)        Color of light or wavelength of light.

(c)        Temperature of the medium: Refractive index decreases with the increase in temperature.

(x)        Reversibility of light and refraction through various medium:

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