1. Department of Physics, Raghunathpur College, P.O. Raghunathpur 723133 Dist., Purulia (WB), India
2. Department of Physics, Moulana Azad College, Kolkata-700013, India
3. Beramara Ram Chandrapur High School, South 24-Pgs, 743609 (WB), India
4. West Kodalia Adarsha Siksha Sadan, New Barrackpore, Kolkata-700131, India
5. Physics and Applied Mathematics Unit (PAMU), Indian Statistical Institute, Kolkata-700108, India