This lecture discusses the production of interference fringes using a single monochromatic light source and Lloyd's mirror. The mirror creates a virtual source that interferes with the original source. It covers the calculation of the vertical distance between the source and the mirror, the nature of the first fringe in contact with the mirror, and the constructive and destructive interference patterns observed. The lecture also explores the separation of fringes on a screen placed at a specific distance from the source. Various calculations and explanations related to interference phenomena are presented.