The book has been written to meet the requirements of graduate students of all Indian Universities. The matter of this book has been detail theory and sufficient solved examples. We have been selected sufficient problems from various Universities examination papers. One of salient course syllabi features of the present edition of the book is the inclusion of a large number of typical worked out problems which will elucidate various abstract principles and theories discussed in the text. It covers the complete syllabus of physics prescribed by Technical Universities. We have tried to our best to keep the book free from the misprint. The author shall be grateful to the readers who point out errors and omissions which inspite of all care might have been there.