·This textbook has been designed to meet the needs of B.Sc. Third Semester students of Physics as per Common Minimum Syllabus prescribed for all Uttar Pradesh State Universities and Colleges under the recommended National Education Policy 2020. · Maintaining the traditional approach to the subject, this textbook comprehensively covers both the parts of the theory papers, namely, Electromagnetic Theory a · The theory part includes important theoretical topics such as Electrostatics, Magnetostatics, Time Varying Electromagnetic Fields, Electromagnetic Waves, Interference, Diffraction, Polarization and Lasers are aptly discussed to give a complete overview of Electromagnetic Theory