What is reflection coefficent?

Reflection coefficient is a measure of the reflectivity of a surface or interface. It is defined as the ratio of the amplitude of the reflected wave to the amplitude of the incident wave at an interface between two media. The reflection coefficient depends on the properties of the two media, such as their acoustic impedance, refractive index, or electrical conductivity. It can be used to characterize the behavior of waves in various fields, such as acoustics, optics, and electromagnetic waves. A high reflection coefficient indicates a high degree of reflection, whereas a low reflection coefficient indicates a low degree of reflection. Reflection coefficients are commonly used in the analysis of wave propagation and the design of efficient devices, such as antennas, optical fibers, and acoustic mirrors.