Bouncing of EM waves off an object with a density different than that of the propagating medium describes which propagation effect?

The bouncing of electromagnetic (EM) waves off an object with a density different from that of the propagating medium is best described by the concept of reflection. In this process, when EM waves encounter a boundary between two different materials (for instance, air and water, or air and metal), some of the energy of the wave is redirected back into the original medium instead of being transmitted through the new medium.

Reflection occurs due to the change in speed and density of the medium, which causes the waves to change direction at the interface. The degree and angle of reflection are determined by the properties of the surfaces and the angle at which the EM wave strikes the surface.

Understanding this concept is fundamental in the field of electronic warfare, where knowing how EM waves interact with various surfaces can influence detection and signaling strategies.