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what is refractive index  
Asked by bhukania.sweta | 07 Jun, 2018, 03:51: PM
answered-by-expert Expert Answer
The ratio of sine of angle of incidence ( sin i) to the sine of angle of refraction ( sin r) is constant for a given pair of media ( such as 'air and glass' or 'air and water').  This value of the constant ( sin i / sin r ) for a ray of light passing from air into a particular medium is called refractive index of that medium. 
 
The refractive index of a medium gives an indication of light-bending ability of that medium.
 
the refractive index can also be written as ratio of speeds of light in the two media. Refractive index of medium-2 with respect to medium-1 is equal to the ratio of speed of light in medium-1 to the speed of light in medium-2
Answered by Thiyagarajan K | 08 Jun, 2018, 12:01: PM

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