I completed the first year of my bachelor in Physics and astronomy in July. One of the courses was 'Waves and Optics' which we used the second half of Alonso & Finn's 'Fields and Waves' for.
I remember not fully understanding the material concerning reflection and refraction, especially when it came to the Fresnel relations, crystals and the so-called index of refraction ellipsoid. I felt like Alonso & Finn didn't quite explain these concepts clearly and/or left out many important details in the discussion, and our professor didn't put much effort into clarifying them either. I did far better in more theoretical courses (Real Analysis II, Classical Mechanics, Electromagnetism) so I'm wondering why this particular subject didn't quite resonate with me.
In fact I feel like this is a bit of a gap in my knowledge of elementary physics, so I'd like to brush up on the subject. Any recommendations concerning the literature?