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A lightbeam consits of a number of individual light rays that travel parallel to each other and hit the surface at the same angle.
A light beam can be thought of as a bundle of individual light rays which are traveling parallel to each other.
Each individual light ray of the bundle follows the law of reflection.
If the bundle of light rays is incident upon a smooth surface, then the light rays reflect and remain concentrated in a bundle upon leaving the surface.
On the other hand, if the surface is microscopically rough, the light rays will reflect and diffuse in many different directions.
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