Topics: vibrations, damped oscillations, forced damped oscillations, waves, optics, reflection, refraction, optical instruments, dispersion, aberration

Topics: Radio broadcasting, television broadcasting, imagine frequency, superheterodyne receiver, automatic gain control, demodulator, mixers, amplifiers, spurious emissions, ganging, tracking, sensitivity, selectivity, speckling, halo graphics recording, video signal, spherical aberration, vestigial sideband signal, flicker noise, transistor thermal noise, image frequency, Halo graphic recording, plumbicon, vidicon, image orthicon