The wiggles in this model are electromagnetic radiation one form of which is light. Light is made by accelerating charges. And Charges are accelerated by light. Which means that when light hits matter, which is made of atoms which are made of charged particles, the charges in the matter wiggle and send out light. The light sent out by matter adds to the incoming light, the resulting sum travels slower than the original light, and is the source of the slowing of the speed of light in matter that produces the index of refraction.
Light is a form of electromagnetic radiation.
These are all waves in the electric field, they have different frequencies and wavelengths. You are free to choose whatever frequency you want to wiggle your comb up and down, but , once the light is created its frequency will not change. The frequency of light and its wavelength are related by the speed of light.