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Why does a diamond sparkle with great b...

Why does a diamond sparkle with great brilliance?

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The brilliance of diamond is due to total internal reflection. Diamond has a high refractive index of 2.417 and therefore a small critical angle of `24.5^@` . Thus, light entering a diamond suffers total internal reflection at nearly all the surfaces.
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Knowledge Check

  • Graphite and diamond are

    A
    Covalent and molecular crystals
    B
    ionic and covalent crystals
    C
    both covalent crystals
    D
    both molecular crystals

  • Garphite and diamond are:

    A
    Covalent and molecular crystals
    B
    ionic and covalent crystals
    C
    both covalent crystals
    D
    both molecular crystals

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