Question
Fri February 22, 2013 By: Virendra Jain
 

Mam, the refractive index of diamond is much greater than that of glass. How does a diamond cutter make use of this fact? Actually mam this question is in my sample paper and it does not contain any answer so i also not get understand of it.

Expert Reply
Sat February 23, 2013
 The refractive index of diamond(2.42) is much greater than that of glass(1.5). The large refractive index results in small critical angle for diamond i.e. about 240. diamond cutter cuts the faces in such a way that light moving from diamond to air always strike the surface at angle greater than critical angle and gets Total Internal Reflection. Thus the diamond shines.
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