The book "Optical Study of a Phenomenon of Total Internal Reflection" by Jesús Pérez Ortiz offers an in-depth analysis of a fascinating physical phenomenon that is of great importance in optics. It is aimed at students and professionals who wish to develop a better understanding of the principles of light reflection and refraction. By describing a specific experiment involving a partially submerged rod in water, the concept of total internal reflection is vividly explained. The author employs various optical principles, including Snell's law and Fermat's principle, to clarify the complex relationships involved. This analytical approach is supported by a clear and precise presentation that enables readers to grasp the theoretical foundations and their practical applications. The book is a valuable work for the scientific community and provides a solid foundation for further studies in optics.