Question
Mon February 18, 2013 By:

what is refractive index of medium? sir please explain me briefly with examples.I always get confused in questions related to the refractive index,please give me tips about this.

Mon February 18, 2013
refractive index is the ratio of speed of light in free space to speed of light in that medium.

According to Snell's law, for a light passing form one medium making an angle of incidence i with the normal of that medium, to another medium refracting at an angle of r
then refractive index of that medium to the first medium is then given as:
sin i / sin r
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