C

n=sqrt(1+8.28156+6.72880/(1-0.44105/pow(x,2))+0.21307/(1-3870.1/pow(x,2)))

Python

n=(1+8.28156+6.72880/(1-0.44105/x**2)+0.21307/(1-3870.1/x**2))**.5

Fortran

n=SQRT(1+8.28156+6.72880/(1-0.44105/x**2)+0.21307/(1-3870.1/x**2))

MATLAB

n=sqrt(1+8.28156+6.72880./(1-0.44105./x.^2)+0.21307./(1-3870.1./x.^2))

LaTeX

n^2-1=8.28156+\frac{6.72880λ^2}{λ^2-0.44105}+\frac{0.21307λ^2}{λ^2-3870.1}