reflectance

/rɪˈflɛktəns/
noun
  1. The measure of how much light or other radiation is reflected by a surface, usually expressed as a percentage.
    • The reflectance of fresh snow is very high, which is why it looks so bright.
    • Engineers measured the reflectance of the paint to ensure it would keep buildings cool.
    • The telescope's mirror has a reflectance of over 95% to capture faint starlight.
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