C

n=sqrt(1+3.9091+5.5565/(1-0.1578/pow(x,2))+1.1287/(1-700/pow(x,2)))

Python

n=(1+3.9091+5.5565/(1-0.1578/x**2)+1.1287/(1-700/x**2))**.5

Fortran

n=SQRT(1+3.9091+5.5565/(1-0.1578/x**2)+1.1287/(1-700/x**2))

MATLAB

n=sqrt(1+3.9091+5.5565./(1-0.1578./x.^2)+1.1287./(1-700./x.^2))

LaTeX

n^2-1=3.9091+\frac{5.5565λ^2}{λ^2-0.1578}+\frac{1.1287λ^2}{λ^2-700}