6.1 Water Waves
6.2 Transverse and Longitudinal Waves
6.3 Describing Waves
6.4 Standing Waves

6.5 Sound
6.6 Doppler Effect
6.7 Musical Sounds

6.8 Electromagnetic Waves
6.9 Types of EM Waves
6.10 Light "Rays"

6.11 Reflection
6.12 Refraction
6.13 Lenses
6.14 The Eye
6.15 Color
6.16 Interference
6.17 Diffraction