Department of Physics, Marwari College, T. M. B. University, Bhagalpur, India
Department of Physics, T. M. B. University, Bhagalpur, India
Copyright © 2018 Dipo Mahto, Anuradha Kumari et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.