Spherical wave transformation

Spherical wave transformation is like a change that happens to waves when they move away from a place they started from. Imagine a rock being thrown in a pond - when the rock hits the water, it makes water waves travel away from the spot where the rock hit the water. These waves can be described as having a spherical shape. As the waves travel further away from the spot where the rock hit the water, the shape of the wave changes. Spherical wave transformation is what happens behind the scenes as the wave shape changes - it describes how the wave shape changes over time and distance.