A Textbook of Optics is a comprehensive book for undergraduate students of Physics. The book comprises chapters on light, reflection and refraction, optical system and cardinal points, thick lenses, dispersion, optical instruments, resolving power, polarization quantum optics, lasers, and fiber optics. In addition, the book consists of several diagrams and chapterwise questions to understand the complex concepts of optics better. This book is essential for students preparing competitive examinations like GATE and NET.