1. Department of Physics, Brhmanada Keshab Chandra College, 111/2, B.T. Road, Kolkata 700108, West Bengal, India
2. Rajkhamar High School, Rajkhamar, Bankura 722205, West Bengal, India
3. Department of Physics, The University of Burdwan, Chaudhuri Lane, R.K. Pally, Kalna Road, Burdwan 713101, West Bengal, India