Lecture
This lecture discusses the phenomenon of refraction in different media, using the example of a basin with water and oil layers. It covers the concept of apparent depth, Snell's Law, and the behavior of light rays at the interface between two media with different refractive indices. The lecture explains how to calculate the apparent depth of an object in a medium with a different refractive index, emphasizing the importance of angles and the refractive indices of the media involved.