Answers

2014-03-21T00:38:43+01:00
It is the measurement of how hard it is for light to travel through a media..The higher the number the harder it is.
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2014-03-21T15:26:26+01:00
the ratio of the velocity of light in a vacuum to its velocity in a specified medium.
  
Refractive index; In optics the refractive index or index of refraction n of a substance is a dimensionless number that describes how light, or any other radiation, propagates through that medium.
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