reflective power; albedo
Technical term used in physics, astronomy, and optics to describe the fraction of incident radiation reflected by a surface.
地球の反射能は約0.3である。
The Earth's albedo is about 0.3.
この惑星の反射能を測定する。
Measure the albedo of this planet.
Compound of 反射 (reflection) and 能 (ability, power). The exact historical derivation is uncertain, but the term is a modern technical coinage.