The angle between the surface normal and the reflected ray is known as the angle of reflection.
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If the angle of reflection is about the same across the screen, no distracting artifacts will be formed.
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Conversely objects with rough surfaces cause the light to be deflected at different angles according to the surface profile resulting in a scattering of light away from the angle of reflection.
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They typically measure some angle of refraction or the critical angle for total internal reflection.
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In conventional use, this also includes deviation of reflected radiation from the angle predicted by the law of reflection.
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Hero demonstrated the equality of the angle of incidence and reflection on the grounds that this is the shortest path from the object to the observer.
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Metals do not suffer from this effect producing higher amounts of reflection at any angle than nonmetals.
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If light inside the prism hits one of the surfaces at a sufficiently steep angle, total internal reflection occurs and all of the light is reflected.
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In specular reflection, the angle of the light reflected from the surface is equal and opposite to the angle of the incident light.