viii
Preface
Target Audience
Immense care has been taken to keep the text as simple as possible. The students can
read the book with minimum guidance from his/her instructor. The book begins with a
thorough analysis of the subject in an easy-to-read style. The conventional approach
appears to stress on the derivations, with a lesser attention paid to the physical
concepts. As a result, the student feels the subject to be monotonous, detached and far
from exciting. An attempt has been made in this book to balance the requirements of
students taking a course and at the same time to make the subject interesting to them.
Therefore, the mathematics is kept at the necessary minimum level and concepts are
given priority over the derivations. Efforts are made to present the subject matter
in a simple and lucid style. Basically, it is a student-friendly book written in a very
simple language.
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Asansol, India
2020
Dr. Puja Dey
Prof. Jitendra Nath Roy