Reflektancia

Reflektancia refers to the property of a surface to reflect incident radiation. It is a measure of how much light or other electromagnetic radiation is reflected back from a surface compared to the amount that strikes it. This property is crucial in various fields, including optics, remote sensing, and material science. Reflektancia is often expressed as a value between 0 and 1, where 0 signifies complete absorption and 1 indicates perfect reflection. It can also be represented as a percentage.

The value of reflektancia is dependent on several factors, including the wavelength of the incident radiation, the angle of incidence, and the physical characteristics of the surface itself. Different materials have distinct reflektancia properties across the electromagnetic spectrum. For instance, a shiny metal surface will have high reflektancia for visible light, while a dark, matte surface will absorb most of the light and exhibit low reflektancia. In remote sensing, reflektancia measurements from the Earth's surface are used to identify different types of land cover, such as vegetation, water, and soil, as they reflect solar radiation differently. Understanding reflektancia is also important in designing optical instruments and in understanding phenomena like the albedo of planets.