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ICSE Class 10 Answered

What is refractive index?
Asked by KANRAR.SOUMEN | 20 Dec, 2022, 10:04: AM
answered-by-expert Expert Answer
Let a light ray travels from a transparent medium-1 to another transparent medium-2 .
 
Let c1 be the speed of light in medium-1 and c2 be the speed of light in medium-2
 
Refractive index n21 of medium-2 with respect to medium-1 is  ratio of speeds of light c2 / c1 .
 
Refractive index n21 = c2 / c1
 
If the light-ray makes angle of incidence i at the inteface of medium-1 and medium-2 ,
 
then if angle of refraction r is in medium-2  , then refractive index n21 of medium-2 with respect to medium-1 is
 
Refractive index n21 =  sin i / sin r
 
Answered by Thiyagarajan K | 20 Dec, 2022, 10:37: AM

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