84 – Wave Optics
84.03 Ripple tank videos
84.06 Laser beam diffracted through various slits 
84.09 Laser beam diffracted by a razor blade
84.12 Laser beam diffracted by a ball bearing (Arago’s spot)
84.15 Laser beam diffracted by an etched ruler
84.18 Laser beam diffracted by reflection gratings
84.21 Spectra (also listed as 88.15, under Modern Physics)
84.24 Soap film interference
84.27 Newton’s rings
84.30 Michelson interferometer
84.33 Mechanical analogue of polarization
84.36 Polarizers
84.39 Polarization of reflected light
84.42 Polarization of microwaves
84.45 Sunset
See also, in chapter 88, Modern Physics:
88.24 Hologram
A video of this demonstration is available (a link is on its page).