The phenomena in which light ray is sent back into the same medium from which it is coming, on interaction with boundary, is called reflection.
Laws of reflection: it states that angle of incident will be equal to angle of reflection for a ray of light reflected from plain polished surface
i.e., The angle of incidence (θi) = Angle of reflection (θr)
Note: The incident ray, the reflected ray, and normal to the surface of incidence always lies in the same plane as shown above. Explanation: According to the law of reflection, the angle of reflection must equal the angle of incidence for each ray.