The Opposite Angle Theorem (OAT).
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reflacion
The law of reflection states that the angle of incidence is equal to the angle of REFLECTION. Refraction is an entirely different phenomenon and has its own law.
The angle of incidence
The angle of incidence is ALWAYS equal to the angle of reflection! This is one of the laws of reflection.
If a light ray is reflected from a flat mirror with a reflection angle of 55o then the angle of incidence was also 55o. When reflecting from a mirrored surface, the angle of incidence equals the angle of reflection.