C

n=sqrt(1+2.165+2.655/(1-0.07891/pow(x,2)))

Python

n=(1+2.165+2.655/(1-0.07891/x**2))**.5

Fortran

n=SQRT(1+2.165+2.655/(1-0.07891/x**2))

MATLAB

n=sqrt(1+2.165+2.655./(1-0.07891./x.^2))

LaTeX

n^2-1=2.165+\frac{2.655λ^2}{λ^2-0.07891}