Affiliation: | (1) Department of Physics, MES College, 679 586 Ponnani, India;(2) Department of Physics, MPMMSN Trust College, 679 523 Shoranur, India;(3) Department of Physics, Farook College, 673 632 Calicut, India;(4) Department of Physics, University of Calicut, 673 635 Malappuram, India |