In an immersion lithography system, an ultraviolet laser beam transitions from air into an experimental liquid. The wavelength of the ultraviolet light in the liquid is observed to be exactly 58\displaystyle \frac{5}{8}85 of its wavelength in air.
What is the refractive index of this liquid?
0.630.630.63
1.261.261.26
1.601.601.60
2.562.562.56
