Sandeep Kansal1*, Rohit Mehra2 and N. P. Singh3
1Department of Physics, Giani Zail Singh College of Engineering and Technology, Bathinda-151001, India.
2Department of Physics, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar-144001, India.
3Punjab Technical University, Jalandhar-144001, India.
