This textbook has been designed to meet the requirements of undergraduate students of Physics and aptly covers the subject by including but not limiting it to Harmonic motion, Waves (Motion, Velocity, Optics), Interference, Diffraction and its different types. Every chapter contains a mix of Multiple-Choice Questions, Fill-in the Blanks and Short- and Long-answer questions to enhance and strengthen learning quotient. Lab experiments have been provided at the end of the book for the practical aspect of the subject and range from Melda's Experiment to Schuster's Focusing. Written in a lucid and concise manner, the textbook has an adept balance between theory with practice.