Hello Forum I have constructing a Michelson Interferometer using sodium light. For viewing the fringes, I have used spectrometer telescope with objective lens of 178mm focal length, 35mm dia and eyepiece 15X. I can see the localized fringes when I view through the objective glass but without eyepiece but I do not see any fringe when I put the eyepiece. I wonder what could be the reason. Is it that the telescope is not of good configuration. I would be grateful for your help.