Hi, I was just wondering if someone can suggest an undergrad textbook which will help me understand SHM, Wave motion, interference and superposition, both mathematically and conceptually. I am having a hard time in my first year second semester course which is focused only on the topics listed above. Also how is Serway/Jewett? Is Resnick/Halladay better for the above topics? Any other suggestions are most welcome. Thank you. Edit: Book suggestions are welcome for both geometrical optics and physical optics.