A) total internal reflection
B) refraction
C) diffraction
D) scattering
Correct Answer: A
Solution :
The brilliance of diamond is due to total internal reflection of light, \[\mu \] for diamond is \[{{2.42}^{o}}\] so that critical angle for diamond-air interface as calculated is \[{{24.4}^{o}}\]. The diamond is cut suitably so that light entering the diamond from any face falls at an angle greater than \[{{24.4}^{o}}\]; suffers multiple total internal reflection at the various faces, and remains with in the diamond. Hence, the diamond sparkles.
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