Institution: | 1. Department of Physics, Government Post Graduate College, Obra, Sonebhadra, U.P., India;2. Department of Physics, B.N.D. College, Kanpur, U.P., India;3. Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi 221005, U.P., India;4. Department of Basic Sciences & Humanities, GMR Institute of Technology, Rajam, A.P., India |