In the 1887 experiment by Michelson and Morley, the length of each arm was 11 m. The experimental limit for the fringe shift was 0.005 fringes. If sodium light was used with the interferometer ( λ=589 nm), what upper limit did the null experiment place on the speed of the Earth through the expected ether?

In the 1887 experiment by Michelson and Morley, the length of each arm was 11 m. The experimental limit for the fringe shift was 0.005 fringes. If sodium light was used with the interferometer ( λ=589 nm), what upper limit did the null experiment place on the speed of the Earth through the expected ether?