- #1

jeast

- 10

- 0

The effective mass density of photons in a vacuum ##\rho^{vac}_M## is related to the photon energy density ##\rho^{vac}_E## by

$$\rho^{vac}_M=\frac{\rho^{vac}_E}{c^2}.$$

Is it true that the mass density of photons inside a medium of refractive index ##n##, ##\rho^n_M##, with phase velocity ##v=c/n##, is related to the photon energy density ##\rho^n_E## by

$$\rho^n_M=\frac{\rho^n_E}{v^2}?$$

$$\rho^{vac}_M=\frac{\rho^{vac}_E}{c^2}.$$

Is it true that the mass density of photons inside a medium of refractive index ##n##, ##\rho^n_M##, with phase velocity ##v=c/n##, is related to the photon energy density ##\rho^n_E## by

$$\rho^n_M=\frac{\rho^n_E}{v^2}?$$

Last edited: