Institution: | a Deptartment of Physics, Presidency College, 86/1 College Street, Kolkata 700073, India b Deptartment of Physics, Maulana Azad College, 8 Rafi Ahmed Kidwai Road, Kolkata 700013, India c Inter University Centre for Astronomy and Astrophysics, Post bag 4, Ganeshkhind, Pune 411007, India d Department of Physics, Barasat Government College, Kolkata 700124, India |