Why does a diamond shine ?

Q : Why does a diamond shine ?

Sol. The brilliance of diamond is due to total internal reflection of light . As refractive index of diamond is high (2.42) , so that critical angle for diamond air interface is low (24.4 degree) . The diamond is cut so suitably that light entering the diamond from any face suffers multiple total internal reflections at the various faces , and remains within the diamond , Hence the diamond sparkles .

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