Newton's Ring Physics Experiment Practical Guide | Physics | IOE
Here, you will get the guide of Newton's Ring Physics Experiment in a PDF file that contains experimentally obtained data which has helped to obtain nearly approximate value of wavelength of sodium light.
https://drive.google.com/uc?export=download&id=165YkfXHsJWkijdtQ1XADRPBkGQ99e8GG