When light encounters a rough surface, the rays will strike the surface at angle(s), which tends to the light rays.

When light encounters a rough surface, the rays will strike the surface at many angle(s), which tends to scatter the light rays.

Explanation:

This is known as diffuse reflection, which occurs when light rays strike on a medium or surface with irregularities (not smooth surface) being this irregularities of an order of magnitude comparable to the size of the wavelength of the incident light, having as a result several rays projected on it.  

In other words:

This phenomenom causes the rays to be reflected in different directions intersecting each other. It happens when light strikes a rough surface, which has many different normal angles (angles that are perpendicular to the surface), then light is reflected in many angles as well.

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