C

n=sqrt(2.470+1.687*pow(x,2)/(pow(x,2)-0.06146))

Python

n=(2.470+1.687*x**2/(x**2-0.06146))**.5

Fortran

n=SQRT(2.470+1.687*x**2/(x**2-0.06146))

MATLAB

n=sqrt(2.470+1.687.*x.^2./(x.^2-0.06146))

LaTeX

n^2=2.470+\frac{1.687λ^{2}}{λ^2-0.06146}