Sapna Sharma is an Associate Professor in the Department of Physics at St. Bede’s College, Shimla, Himachal Pradesh, India, having a teaching experience spanning over 23 years. Currently, she is carrying on her research in the field of Physics Education Research (PER). Her work mainly focuses on the understanding of conceptual difficulties of stuSapna Sharma is an Associate Professor in the Department of Physics at St. Bede’s College, Shimla, Himachal Pradesh, India, having a teaching experience spanning over 23 years. C….