C

n=sqrt(1+4.68+1.53/(1-0.366/pow(x,2)))

Python

n=(1+4.68+1.53/(1-0.366/x**2))**.5

Fortran

n=SQRT(1+4.68+1.53/(1-0.366/x**2))

MATLAB

n=sqrt(1+4.68+1.53./(1-0.366./x.^2))

LaTeX

n^2-1=4.68+\frac{1.53λ^2}{λ^2-0.366}