Determination of the wavelength of He - Ne Laser Light and use it to measure the thickness of a thin wire by diffraction of light | Physics Practical | IOE
Here, you will get the guide of He - Ne Laser Physics Experiment in a PDF file that contains experimentally obtained data which has helped to obtain nearly approximate value of the wavelength of He - Ne Laser Light and was used to determine the thickness of hair or thin wire in the lab.
https://drive.google.com/uc?export=download&id=1Ebny_Sk0E1osCY4sjwhdJhk7RJh-Dv1O