USP Light Delay in Glass: A Field-Based Explanation of Photon Re-Emission

This document presents a USP Field Theory–based explanation for why light slows down in dense media like glass. Instead of assuming a reduction in the intrinsic speed of light, the theory attributes the observed delay to repeated photon re-coupling and re-emission at the atomic scale. Using average atomic spacing and known refractive slowdown, the estimated delay per photon-atom interaction is approximately 4.18 attoseconds per meter — aligning with experimental observations. The analysis provides a deterministic, field-geometry-based alternative to classical refraction models, supporting the view that light maintains its true speed while adapting to material structure.