1. Department of Physics, Rajah Serfoji Government College (Autonomous), Thanjavur 613005, Tamil Nadu, India
2. Department of Physics, Government First Grade College, Chikkaballapur 562101, Karnataka, India
3. Department of Physics, Government First Grade College, Devanahalli 562110, Karnataka, India
4. Department of Physics, R. V. College of Engineering, Bengaluru, Affiliated to Visvesvaraya Technological University, Belagavi 590018, Karnataka, India
5. Department of Physics, Government First Grade College, Mulbagal 563131, Karnataka, India
6. Department of Physics, Government First Grade College, Malur 563130, Karnataka, India