Fringes, colours, haloes and glare: what light does because it is a wave.
Light as a transverse electromagnetic wave: Huygens' principle and the laws of reflection and refraction, Young's double-slit experiment and fringe width, optical path, thin-film colours, the Fresnel biprism, coherence, diffraction by a slit, a circular hole and an edge, the limit of resolution, scattering and the blue sky, and polarization with polaroids, Malus' law and Brewster's angle.