Reflectance is the measure of how much light is reflected off a surface relative to the amount of light that hits it. In the research area of reflectance, scientists study the properties of various materials or surfaces in relation to how they interact with light. This can involve measuring the reflectance spectra of different materials, analyzing the factors that affect reflectance such as surface roughness or composition, and developing models to predict reflectance under different conditions. Reflectance research is important in fields such as remote sensing, agriculture, and materials science, as it can provide valuable information about the physical properties of objects and materials.