The discussion centers on understanding how electromagnetic waves behave when transitioning from water to glass. It emphasizes that while the frequency of the wave remains constant, the wavelength and velocity change due to the different mediums. Participants clarify that if 100 waves per second enter glass from water, the same number must exit, reinforcing that frequency does not change. The conversation concludes that in glass, the wave's velocity decreases, which in turn decreases the wavelength. Overall, the key takeaway is that frequency remains constant while wavelength and velocity are affected by the medium.
