doc/2.physics.md: fix eq reference

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Michele Guerini Rocco 2022-05-12 00:25:52 +02:00
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@ -231,7 +231,7 @@ $$
≈ 4 \frac{ω}{c} {{\text {Im}}(N_{\perp w})} ≈ 4 \frac{ω}{c} {{\text {Im}}(N_{\perp w})}
\frac {N_{\perp}} {|{∂ Λ}/{∂ {\bf N}|}} \biggr|_{Λ=0} \frac {N_{\perp}} {|{∂ Λ}/{∂ {\bf N}|}} \biggr|_{Λ=0}
= 2{{\text{Im}}(k_{\perp w})} \frac{v_{g\perp}} v_{g}. = 2{{\text{Im}}(k_{\perp w})} \frac{v_{g\perp}} v_{g}.
$$ {eq:alpha} $$ {#eq:alpha}
being $N_{\perp w}$ (and $k_{\perp w}$) the perpendicular refractive index (and being $N_{\perp w}$ (and $k_{\perp w}$) the perpendicular refractive index (and
wave vector) solution of the relativistic dispersion relation for EC waves wave vector) solution of the relativistic dispersion relation for EC waves
$$ $$