Answers

2015-06-23T15:08:29+05:30
 sketch the diagram yourself . u will find 
i + r = 90°
now refractive index of the medium 
μ = sini/sinr
  =  sini/sin(90° - i)         as i + r = 90°
  = sini/cosi
  = tani
and as i = 60° so μ = tani = tan 60° = √3
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