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explain relative refractive index??
Asked by zahirqk | 08 Jan, 2023, 09:50: AM
answered-by-expert Expert Answer
To understand relative refractive index , we should know about absolute refractive index
 
When light ray travelling in air or vacuum ,  incident on interface of air-refracting medium and then getting refracted in refracting medium ,
 
then the refractive index of medium is considered as absolute refractive index.
 
For example,  let light ray is travelling in air , incident on glass surface and then refracted into glass.
 
In this example , to get the angle of refraction from known angle of incidence, we use the absolute refractive index of glass that is 1.52 .
 
Similarly , let light ray is travelling in air , incident on water surface and then refracted into water.
 
In this example , to get the angle of refraction from known angle of incidence, we use the absolute refractive index of water that is 1.333 .


Relative refractive index is used when the light is initially travelling in a medium-1 other than air and getting refracted into
another medium-2 , then relative refractive index of medium-2 is the ratio of absolute refractive index of medium-2 to
the absolute refractive index of medium-1.
 
For example, if light is travelling initially in water and then refracted into glass ,
 
then relative refractive index of galss with respect to water = 1.52/1.333 = 1.143
Answered by Thiyagarajan K | 08 Jan, 2023, 03:04: PM

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