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    Question

    The sparkling of a diamond is due to

    –
    A total internal reflection of light Correct Answer Incorrect Answer
    B interference of light Correct Answer Incorrect Answer
    C polarisation of light Correct Answer Incorrect Answer
    D refraction of light Correct Answer Incorrect Answer

    Solution

    Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.

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