The speed of light in a diamond is effectively cn where n is the index of refraction. Since the speed of light is always less than c in matter and equals c only in a vacuum the index of refraction is always greater than or equal to one. Even if the vacuum is inside a box in a rocket traveling away from earth both an astronaut in the rocket and a hypothetical observer on earth will measure the speed of light moving through that box to be exactly c.
Favorite Answer If the refractive index is 2419 it means that the speed of light in a diamond is cn or 3x1082419 124018189x108 ms Btw the speed of light in a vacuum in 3x108.
It is exact because by international agreement a metre is defined as the length of the path travelled by light in vacuum during a time interval of 1 299 792 458 second. 2533 n c v where v is the observed speed of light in the material. The refractive indices of glycerine and diamond with respect to air are 14 and 24 respectivelycalculate the speed of light in glycerine and diamondFrom these results calculate the refractive index of diamond with respect to glycerine. See full answer below.