Diffraction and Interference in Vision

This lecture discusses the phenomenon of diffraction and interference in vision, focusing on the perception of the moon and the creation of a halo due to diffraction caused by water droplets. Through geometric calculations and approximations, the instructor explains how the perceived angle and width of the diffraction pattern are related to the diameter of the water droplet. By comparing these values with the dimensions of the human eye, specifically the retina, it is demonstrated why the retina is not narrow enough to create a diffraction pattern, leading to the explanation of the observed halo.