AJAY WADHWA [M.Sc. (IIT Kanpur), Ph.D. (Delhi University)] is Associate Professor of Physics at Sri Guru Tegh Bahadur Khalsa College, University of Delhi. He has a number of research publications to his credit in reputed national and international journals. His special interests include the field of Physics Education on which he is currently working through a UGC-sponsored major research project. He has also authored five books.