Problem 5.210

The refractive index of carbon dioxide at the wavelengths $509,534,$ and $589 \mathrm{nm}$ is equal to $1.647,1.640,$ and 1.630 respectively. Calculate the phase and group velocities of light in the vicinity of $\lambda=534 \mathrm{nm}$

Reveal Answer

\begin{aligned} & 5.210 . v=c / n=1.83 \cdot 10^{8} \quad \mathrm{~m} / \mathrm{s}, \quad u=[1+(\lambda / n)(d n / d \lambda)] c / n=\\ =& 1.70 \cdot 10^{8} \mathrm{~m} / \mathrm{s} . \end{aligned}

Dispersion and Absorption of Light