C

n=sqrt(1+1.5149/(1-pow(0.0878/x,2)))

Python

n=(1+1.5149/(1-(0.0878/x)**2))**.5

Fortran

n=SQRT(1+1.5149/(1-(0.0878/x)**2))

MATLAB

n=sqrt(1+1.5149./(1-(0.0878./x).^2))

LaTeX

n^2-1=\frac{1.5149λ^2}{λ^2-0.0878^2}