About Authors
K.L. Chopra is a retired Associate Professor in Physics who taught Physics to undergraduate students at “Hans Raj College, University of Delhi, Delhi” for more than 42 years. He is the winner of Dr. K.S. Krishnan “Gold Medal” of Delhi University in 1967 for M.Sc. (Physics). He is also “first-class first in B.Sc. (Hons.) Physics examination of Delhi University in 1965. He has been a highly respected teacher, throughout his career. He has been a resource person for teacher training and other academic work of several esteemed organizations. He is also the co-author of a number of textbooks for undergraduate, senior secondary and secondary school students.