The Transmission Coefficient is a measure used in physics and engineering to describe how much of a wave, such as light or sound, passes through a material compared to how much is reflected or absorbed. It is expressed as a ratio or percentage, indicating the efficiency of the material in transmitting the wave. A higher transmission coefficient means more energy is transmitted, while a lower value indicates more energy is lost. This concept is important in various applications, including optics, where it helps in designing lenses and coatings, and in acoustics, where it influences soundproofing materials. Understanding the transmission coefficient can aid in improving technologies like solar panels and communication systems.