Modified Newton's rings: II
Abstract
In an earlier work (Shankar kumar Jha, A Vyas, O S K S Sastri, Rajkumar Jain & K S Umesh, 'Determination of wavelength of laser light using Modified Newton's rings setup', Physics Education, vol. 22, no.3, 195-202(2005)) reported by our group, a version of Newton's rings experiment called Modified Newton's rings was proposed. The present work is an extension of this work. Here, a general formula for wavelength has been derived, applicable for a plane of observation at any distance. A relation between the focal length and the radius curvature is also derived for a plano-convex lens which is essentially used as a concave mirror. Tracker, a video analysis software, freely downloadable from the net, is employed to analyze the fringes captured using a CCD camera. Two beams which give rise to interference fringes in conventional Newton's rings and in the present setup are clearly distinguished.
Cite
@article{arxiv.1005.3590,
title = {Modified Newton's rings: II},
author = {T. Sai Chaitanya and Rajiv kumar and V. Sai Krishna and B Shankar Anandh and K. S. Umesh},
journal= {arXiv preprint arXiv:1005.3590},
year = {2015}
}