What is the Critical Angle for the diamond-air interface?

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What is the Critical Angle for the diamond-air interface?

The Critical Angle for the diamond-air interface is 24 degrees. This means if the ray of light in the diamond medium strikes the separating surface between the diamond and air making an angle more than 24 degrees with the normal to the point of incidence then that ray of light will undergo a total internal reflection and comes back to the diamond medium.
This is the reason behind the sparkles of diamonds.

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What is the Critical Angle for the diamond-air interface?
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