The light rays come back along the same path because the incident rays fall on the mirror along the normal to the reflecting surface. This adherence to the normal during incidence ensures that the angle of reflection is equal to the angle of incidence, as per the laws of reflection.
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Light rays come back along the same path after reflection from a mirror due to the law of reflection. According to this law, the angle of incidence (the angle between the incident ray and the normal) is equal to the angle of reflection (the angle between the reflected ray and the normal). This symmetry ensures that the reflected rays trace the same path as the incident rays, maintaining an equal angle of incidence and reflection. The law of reflection is a fundamental principle governing the behavior of light upon reflection, contributing to the predictability and consistency of the reflection process in mirrors.