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Laws of Reflection of a Plane Wave by a Plane Surface #8211; Huygens principle using constructed reflection of a plane wave by a plane surface. The law of reflection states that angle of incidence is equal to the angle of reflection, Here, AB is a plane wave. MN is the reflecting surface, v is the speed of wave, t is the time taken by the wavefront to reach from B to C. So, BC = vt = AE. In the above diagram, we can see that ∆AEC and ∆ABC are congruent and hence their corresponding angles are equal, ∠i = ∠r.
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