The answer varies from one surface to another. A highly polished mirror will reflect almost all whereas a rough black body will reflect very little.
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An albedometer is an instrument used to measure the albedo - the fraction of incident light or radiation reflected by a body - of a surface.
interference
incident ray-the light ray striking a reflecting surface is called the incident ray. reflected ray-the light ray obtained after reflection from the surface, in the same medium in which the incident ray is travelling , is called the reflected ray.
Specular reflection
it reflicts back up