Dispersion of light by a prism and dispersion by thin films operate through distinct mechanisms, despite both being wave phenomena. In a prism, dispersion occurs due to wavelength-dependent refraction, which requires absorption within the material, as explained by Kramers-Kronig relations. In contrast, thin films disperse light through interference without necessitating absorption. The two processes are fundamentally different and cannot be directly compared. Understanding these differences is crucial for grasping the principles of light behavior in various contexts.
