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2014-11-24T06:40:59+05:30

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Μ = refractive index = speed of light in vacuum / speed of light in medium = c / v
  = sin i / sin r

v = c sin r / sin i

v is minimum for the medium having the least r.
If the angles of refraction are 15, 25, and angle > 25,  then speed is minimum for the medium with r = 15 deg.

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