Light enters from air into diamond,which has a refractive index of $2.42$. Calculate the speed of light in diamond. The speed of light in air is $3.0 \times 10^{8} \text{ m s}^{-1}$.

  • A
    $1.24 \times 10^{8} \text{ m s}^{-1}$
  • B
    $1.50 \times 10^{8} \text{ m s}^{-1}$
  • C
    $2.42 \times 10^{8} \text{ m s}^{-1}$
  • D
    $7.26 \times 10^{8} \text{ m s}^{-1}$

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