The discussion centers on finding comprehensive books that cover the Faraday rotator and the Faraday effect in optics. The only mentioned textbook is Melvin Schwartz's "Principles of Electrodynamics," which provides some information on the topic. However, the participant notes a lack of book references, as most available information is found in articles rather than textbooks. The conversation highlights the challenge of locating in-depth resources specifically focused on the Faraday effect within the context of optics.