Hi, I want to ask about the Wave behavior of light. Fine, I know all about the slit experiments and the resultant interference patterns - but I want to ask about the physical context. So light is the carrier of electromagnetic force, and thus its wave oscillation pattern represents an oscillation in the level of electromagnetism or electromagnetic force as it travels through space. When we look at a crest in the wave function, this is supposed to represent a peak in electromagnetism or consequent electromagnetic force experienced at that point. Meanwhile wherever the wave function approaches a centerline value, that represents a zero amount of electromagnetism or consequent electromagnetic force experienced. But when we look at a trough, what is that supposed to represent - force in the opposition direction? Is it negative electromagnetism? Sure, we know from the slit experiments that the troughs cause the dark parts of the interference patterns - but what are they, physically? Are they traveling "darkness"? We know from basic constructive/destructive interference that a trough can cancel with a crest to produce a zero/ambient result. So is the trough "anti-light" and "anti-force" value? The problem with purely relying on these slit experiments and their interference patterns, is that it's like explaining something using metaphors. I can easily see what a peak and trough represent in water waves. The peak/crest of the water wave is its peak height, while the crest is its lowest height which lies below the ambient "sea level". Height is very intuitive, and needs no metaphor to rely upon to be understood. But what exactly do the peaks and troughs and centerlines of wavefunctions for light mean?