1. Department of Physics and Research Centre, Muslim Arts College, Tiruvithancode, Tamilnadu, India
2. Affiliated to Manonmanium Sundaranar University, Tirunelveli, Tamilnadu, India
3. Department of Physics and Research Centre, Malankara Catholic College, Mariagiri, Tamilnadu, India
4. Department of Physics (H & Sc), Methodist College of Engineering & Technology (Autonomous), Abids, Hyderabad, India