C

n=sqrt(1+1.30628/(1-0.02268/pow(x,2))+0.00502/(1-0.18487/pow(x,2)))

Python

n=(1+1.30628/(1-0.02268/x**2)+0.00502/(1-0.18487/x**2))**.5

Fortran

n=SQRT(1+1.30628/(1-0.02268/x**2)+0.00502/(1-0.18487/x**2))

MATLAB

n=sqrt(1+1.30628./(1-0.02268./x.^2)+0.00502./(1-0.18487./x.^2))

LaTeX

n^2-1=\frac{1.30628λ^2}{λ^2-0.02268}+\frac{0.00502λ^2}{λ^2-0.18487}