But, what if two beams of light destructively interfere as they pass through a small prism, so there is no apparent wave or wavelength at that point in space?
For example, suppose you have two otherwise identical infrared laser beams traveling in almost the same direction intersecting at a prism with one beam 180 degrees out of phase producing total destructive interference at that small area in space. The beams intersect at the prism at a slight angle like an elongated x.
The index of refraction is wavelength dependent but if the waves are totally cancelled in the prism, would the beams exit the prism at same angle as if the beams constructively interfered?
I assume there are no “waves” and thus no detectable wavelength per se while beams are in the glass if there is total destructive interference at that point in space.