regarding refraction of light......
Asked by | 26th Jan, 2010, 12:17: AM
Expert Answer:
refractive index = speed of light in vacuum/speed of light in medium.
speed of light in medium = speed of light in vacuum/refractive index.
speed of light in medium 
1/refractive index.
speed of light in medium 1/(sin i/sin r)
As we can see for the same angle of incidence, the speed of light in the medium is directly propotional to the sin of angle of refraction.
Hence the speed of light will be minimum in medium A.
Regards,
Team,
TopperLearning.
Answered by | 26th Jan, 2010, 10:01: AM
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