Abstract
For light waves
where c is the speed of light in vacuum and n(k) is the index of refraction of the corresponding medium. According to equation (18.3) we obtain the phase velocity
To calculate the group velocity, we write formally
and with equation (19.1 a) we obtain
if the functions w(k) and n(w) are differentiable so that dn/dk = (dn/dw)(dw/dk).
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© 1998 Springer Science+Business Media New York
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Greiner, W. (1998). Light Waves. In: Classical Electrodynamics. Theoretical Physics. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-0587-6_19
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DOI: https://doi.org/10.1007/978-1-4612-0587-6_19
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