The ability to reflect light refers to the property known as reflectance. Reflectance is a measure of how much light is reflected off a surface when light hits it. It is expressed as a percentage, with 0% meaning that no light is reflected and 100% meaning that all light is reflected. The higher the reflectance, the brighter and more visible a surface appears.

Reflectance is an important characteristic in many applications, such as designing coatings, paints, and fabrics. It can also be used to determine the color and texture of a surface. In optics, reflectance is a key factor in determining the efficiency and performance of optical systems.