Optics SUB-MENU Optics Sub-menu Problem NoChaptersChapters


649.


Problem 45.49 (RHK)


If mirror in Michelson’s interferometer is moved through 0.233 mm, 792 fringes are counted with a light meter. We have to find the wavelength of light.



Solution:           Click For PDF Version

When one of the mirrors of the Michelson’s interferometer, say , is moved by o.233 mm, the additional path difference between the rays that interfere to form fringe will be

.

If 792 fringes are counted during the process, the path difference x will be related to wavelength as