A cut diamond sparkles because of _________ .

hardness

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high refractive index

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emission of light by the diamond

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absorption of light

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Solution

The correct option is B high refractive index
Diamond has a very high refractive index. Because of this, its critical angle is very small. This leads to the total internal reflection of most of the light inside the medium. Also, the diamond faces are carefully cut. This leads to light coming from different faces. This is the reason diamond sparkles.

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