A) it has low refractive index.
B) it has high transparency.
C) it has high refractive index.
D) it is very hard.
Correct Answer: C
Solution :
Option [c] is correct Explanation: The brilliance of diamond is due to its too small critical angle with air. As the critical angle become smaller, value of sine of critical angle also become small and hence refractive index increases (since \[\mu =1/sinC\]). So, the basic reason for the extraordinary sparkle of suitably cut diamond is its high refractive index.
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